In the U.S. state of California, U.S. Route 101 (US 101) is one of the last remaining and longest U.S. Routes still active in the state, and the longest highway of any kind in California. US 101 was also one of the original U.S. Routes established in 1926.

This route is part of the California Freeway and Expressway System.

Route description

Los Angeles to Ventura

The south terminus of U.S. Route 101 is in Los Angeles, about one mile (1.6 km) east of downtown Los Angeles at the East Los Angeles Interchange, also known as the "Commuters' Complex." This southernmost portion is named the Santa Ana Freeway, inheriting that title as the northerly extension of the roadway now known as Interstate 5.

After merging with westbound traffic from the San Bernardino Freeway , U.S. Route 101 then proceeds northwest via the Downtown Slot under the northern edge of Los Angeles' Civic Center to State Route 110 at the Four Level Interchange. From here, U.S. 101 becomes the Hollywood Freeway. It then heads to Hollywood and up through the Cahuenga Pass before reaching the San Fernando Valley.

Highway 101 then intersects with State Route 134 and State Route 170 at the interchange known as the Hollywood Split. Here, the alignment of U.S. 101 'shifts' to the alignment of SR 134 (i.e. heading northbound, the road's alignment turns left, or westbound) and thereafter is referred to as the Ventura Freeway until it reaches Ventura. Confusingly, the "Hollywood Freeway" name continues northward from this interchange on SR 170, and the "Ventura Freeway" name continues eastward to SR 134.

From the Hollywood Split, U.S. 101 is an east-west highway until it reaches Gaviota State Park in Santa Barbara County where it shifts back to a north-south alignment. Along the way, it meets with the 405 freeway. This interchange was named the worst interchange for traffic in the United States. The east-west geographical alignment of the Ventura Freeway and the north-south designation on freeway signs can be confusing to visitors; the same freeway entrance can often be signed as "101 North" and "101 West"; this is most common in the San Fernando Valley.

Upon reaching Ventura, there is an interchange with SR 126, aka the Santa Paula Freeway.

Central Coast

North of Ventura, U.S. 101 is an intermittent freeway (i.e. there is occasional cross traffic), but there are no traffic signals until San Francisco. The last traffic signals along this stretch of the highway were removed in the early 1990s when the section through downtown Santa Barbara was constructed after years of resistance from the Santa Barbara community.

From Ventura and through Santa Barbara, Highway 101 closely follows the Pacific coastline (generally no more than one to two miles (3 km) from the shore) until Gaviota State Park, about 23 miles (37 km) west of Goleta. At Gaviota State Park, the highway shifts back from an east-west highway to a north-south alignment. About north of this point, U.S. 101 passes through the Gaviota Tunnel.

A few miles north of the Gaviota Tunnel, State Route 1 splits from U.S. 101 and heads northwest, running along the Pacific coastline parallel and to the west of U.S. 101.

Farther north, State Route 1 rejoins 101 for a section between Pismo Beach and San Luis Obispo. Then U.S. 101 takes an inland route through the Salinas Valley, while Highway 1 heads northwest, running along the Pacific coastline in California, parallel and to the west of U.S. 101.

A steep segment (7% grade) between San Luis Obispo and Atascadero is known as the Cuesta Grade. North of Atascadero, the highway joins State Route 46 (SR 46) for about three miles (5 km) through Paso Robles.

From Paso Robles to Salinas, U.S. 101 is an expressway known as the Salinas River Valley Highway, since the Salinas River Valley extends from Santa Margarita to the State Route 156 junction in Prunedale. The highway passes Camp Roberts south of Bradley as well as the San Ardo Oil Field about five miles (8 km) south of the town of San Ardo. Near this point, the wide agricultural bottomlands of the Salinas Valley begin.

San Francisco Bay Area

When U.S. 101 reaches Gilroy, it becomes the South Valley Freeway, and it then heads through the suburb of Morgan Hill before reaching San Jose. From San Jose to San Francisco, Highway 101 is known as the Bayshore Freeway as it passes through Palo Alto and the other major communities along the San Francisco Peninsula. This segment was originally Bayshore Boulevard, later redesignated the 101A bypass and upgraded to freeway by the late 1950s. This section of 101 from San Jose north to San Francisco is very heavily travelled. The stretch between Redwood City and South San Francisco was the Bay Area's first freeway when it opened in 1947; over the next 20 years the stretches from San Jose to Redwood City and South San Francisco to San Francisco were upgraded to freeway.

Highway 101 is called the James Lick Freeway, named for James Lick, a philanthropist, from the San Francisco county/city line, through the interchange with I-280 at the Alemany Maze, until the junction with the San Francisco Skyway (Interstate 80) and the Central Freeway near the city's Civic Center. Highway 101 continues in a northwestern direction on the Central Freeway, and then leaves the freeway to run north on Van Ness Avenue. At the intersection of Van Ness Avenue and Lombard Street, Highway 101 heads west on Lombard Street, and then on Richardson Avenue, entering The Presidio, where it becomes a divided highway again (known as Doyle Drive). It is then joined by Route 1 before approaching and crossing the Golden Gate Bridge.

From San Francisco north the highway is heavily traveled by commuters through to Windsor, just north of Santa Rosa. North of the Golden Gate Bridge, U.S. 101 enters Marin County and is known as the Redwood Highway. After crossing the bridge, U.S. 101 climbs the Waldo Grade and passes through the Waldo Tunnel, the first of its kind in 300 miles (the other being the Gaviota Tunnel in Santa Barbara County), before passing through San Rafael and Novato. The section between Novato in Marin County and Petaluma in Sonoma County changes from its original six or eight lanes through Marin to four lanes, and is thus called the "Novato Narrows" by locals. The entire area between Novato and Petaluma is also the voter approved Novato–Petaluma Community Separator, which forbids most development.

Upon entering Sonoma County it continues as a four lane freeway. It proceeds up the Alexander Valley with the Russian River before leaving Sonoma County and entering Mendocino County.

North Coast

The freeway portion ends north of Cloverdale near the Mendocino County line, and it narrows to an expressway and eventually a two-lane road south of Hopland, the first time since leaving San Francisco. There are plans for a proposed bypass to the east of Hopland which would make US 101 from its inception in Los Angeles to Ukiah a four-lane road. In the community of Calpella, State Route 20 merges with US 101, where it will remain that way until reaching the city of Willits. South of Willits, US 101 ascends Ridgewood Summit, the highest elevation along the route's trek through California. SR 20 splits from US 101 in downtown Willits. US 101 leaves Willits as a two-lane road, but it soon widens to a four-lane expressway until the intersection with the western portion of State Route 162, where it reverts back to a two-lane road. North of Laytonville, US 101 follows the South Fork Eel River and Eel River to Fortuna near the mouth of the river. About northwest of Laytonville, US 101 becomes an undivided freeway near the community of Cummings. SR 271 is the old portion of US 101 through this area. At Leggett, US 101 meets SR 1 for the last time, and from this point until Piercy, US 101 runs along a substandard section of highway with frequent landslides, which Cal Trans is now bypassing with unique bridge construction to move the highway across the Eel River away from the troubled spots. North of Piercy, the freeway portion again ends and the road narrows down to two lanes, before another stretch of divided highway. Arriving in Humboldt County, another narrow two lane portion of highway 101 bisects Richardson Grove State Park. Just after the park boundary, the highway becomes a divided freeway, which continuing north by northwest, passes through the Humboldt Redwoods State Park. A preserved portion of the original, bypassed highway route, known as the Avenue of the Giants for the huge, centuries-old redwood trees, parallels the highway for over in southern Humboldt County. There is also a section of freeway through Rio Dell. After the junction for State Route 36 (also the western terminus for that route), US 101 becomes a freeway again between Fortuna and Eureka. North of Humboldt Hill, the road enters the City of Eureka (a potential bypass of the city was successfully blocked repeatedly). As the route traverses Eureka, the southern portion is known as "Broadway" and then as it bears east along Humboldt Bay, the Highway is aligned on a one-way couplet (4th and 5th Streets). Five miles later the highway leaves Eureka's northern city limit and continues north. The expressway style section between Eureka and Arcata, which is also a safety corridor, is named the "Michael J. Burns Freeway," in honor of the State Senator who was a proponent of California's Highways. The Highway becomes an unobstructed Freeway through the center of Arcata, passing the junction for State Route 299 (also the western terminus for that route), in the Valley West (northernmost) part of the college town. The highway continues north as it skirts westerly around McKinleyville on a high bluff north of the Mad River. As the highway reaches Clam Beach (a county park), motorists get their first magnificent full view of the Pacific Ocean north of the Golden Gate. North of Trinidad, the highway narrows to one lane in each direction after crossing Big Lagoon to pass inland of Stone Lagoon and follow the coastal bar between Freshwater Lagoon and the Pacific Ocean south of Orick, California. After a freeway through Redwood National and State Parks running inland east of the Prairie Creek Redwoods State Park boundary, the highway again narrows to one lane in each direction at the Klamath River. The original placement of the highway near giant Coast Redwoods led to increased awareness of the destruction of the redwoods after decades of extensive logging, which ultimately led to the establishment of Redwood National Park in 1968. The original highway segment through Prairie Creek Redwoods State Park is now a scenic alternate similar to Avenue of the Giants, named Newton B. Drury Scenic Parkway in honor of the fourth director of the National Park Service and executive director of the Save-the-Redwoods League. North of Klamath, the highway closely follows the Pacific coast again. In Crescent City, the highway once again separates into a one-way couplet (L and M Streets) for nine blocks. As it leaves Crescent City, U.S. 101 becomes a divided freeway for the last time in California (built slightly to the west of the original two-lane alignment, now called Parkway Drive). As the 3-mile divided freeway portion ends, U.S. 101 intersects the southern terminus of U.S. Route 199, which heads northeast as the Redwood Highway, terminating in Grants Pass, Oregon. Highway 101 (no longer called the "Redwood Highway" at this point) is reduced to two lanes and continues north along the California coast until it reaches the Oregon border.

History

Instead of terminating in Los Angeles, Highway 101 used to travel all the way south through San Diego to the United States–Mexico border in San Ysidro. However, this part was deleted in the late 1960s in favor of Interstate 5. The only remnant of the old route is a mileage sign at the Santa Barbara/Ventura County line, which lists the distance to San Diego, even though Highway 101 ends in Los Angeles.

The old alignment in San Diego County from Oceanside to Del Mar is now known as San Diego County Route S21. It is signed unofficially in many places as "Historic Route 101". Before I-5's implementation in the 1960s, long sections of 101 in this area (through USMC's Camp Pendleton and south to the northern reaches of San Diego) were three lanes, with the center lane being a 'passing lane' for both northbound and southbound drivers. Horrific and fatal head on collisions were not uncommon. In newspaper accounts, it was often referred to as the "suicide lane".

Significant portions of 101 were originally known as the Royal Road or El Camino Real. The name, El Camino Real, continues in widespread use from South San Francisco to San Diego for surface routes, most of which are close to, and parallel to 101.

Major intersections

Note: Except where prefixed with a letter, postmiles were measured in 1964, based on the alignment as it existed at that time, and do not necessarily reflect current mileage. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County	Location	Postmile	#	Destinations	Notes
Los Angeles LA S0.00-38.19	Los Angeles	S0.00			Southbound exit and northbound entrance
			133	Euclid Avenue	Southbound exit and northbound entrance
		S0.02	1A	Seventh Street	Signed as exit 1A southbound
		S0.62	1A	Fourth Street	Signed as exit 1B southbound; no northbound entrance
		S0.91	1B	First Street	Signed as exit 1C southbound; no southbound entrance
			1C	Cesar Chavez Avenue	Northbound exit only
		S1.33 0.00	1D		No southbound entrance; left exit southbound
			1E	Mission Road	No northbound exit
		0.39	2A	Vignes Street	Northbound exit and entrance
		0.76	2B	Alameda Street – Union Station	No southbound exit
		0.87	2B	Los Angeles Street	No northbound exit
		1.01	2C	Spring Street	Northbound exit only
		1.08	2C	Broadway	Southbound exit and northbound entrance
		1.32	3A	Grand Avenue, Temple Street	Northbound exit is part of exit 3
		1.62	3B		Signed as exit 3 northbound;
		2.48	4A	Glendale Boulevard, Echo Park Avenue, Union Avenue, Belmont Avenue
		2.86	4B		South end of SR 2 overlap
		3.34	5A	Rampart Boulevard, Benton Way
		3.76	5B	Silver Lake Boulevard
		4.40	6A	Vermont Avenue
		4.85	6B	Melrose Avenue, Normandie Avenue
		5.55	7		North end of SR 2 overlap
		6.25	8A	Sunset Boulevard	No northbound entrance
		6.52	8B	Hollywood Boulevard
		6.91	8C	Gower Street
		7.06	9A	Vine Street	Southbound exit only
		7.46	9B	Cahuenga Boulevard – Hollywood Bowl	No northbound entrance; signed as exit 9A northbound
		7.84	9C	Highland Avenue (SR 170 south) – Hollywood Bowl	South end of SR 170 overlap; signed as exit 9B northbound
		9.22	11A	Barham Boulevard – Burbank	Signed as exit 11 southbound
		9.60	11B	Universal Studios Boulevard	Northbound exit and entrance; serves Universal Studios Hollywood
		10.34	12A	Lankershim Boulevard – Universal City
		10.56	12B	Ventura Boulevard	No southbound exit
		11.11	12C	Vineland Avenue	Signed as exit 12B southbound
		11.65	13B		Southbound exit and northbound entrance
		11.80	13		North end of SR 170 overlap, northbound exit and southbound entrance
		11.83	13A	Tujunga Avenue	Southbound exit and northbound entrance
		12.85	14	Laurel Canyon Boulevard – Studio City
		13.88	15	Coldwater Canyon Avenue
		14.89	16	Woodman Avenue
		15.91	17	Van Nuys Boulevard
		16.94	18	Sepulveda Boulevard	Northbound exit and southbound entrance
		17.17	19A		Former SR 7
		17.50	19B	Haskell Avenue	No southbound entrance
		18.61	20	Hayvenhurst Avenue	Northbound exit and southbound entrance
		19.22	21	Balboa Boulevard – Encino
		20.23	22	White Oak Avenue
		21.25	23	Reseda Boulevard
		22.25	24	Tampa Avenue
		23.26	25	Winnetka Avenue – Woodland Hills
		24.31	26A	De Soto Avenue, Serrania Avenue	Signed as exit 26 southbound
		24.85	26B	Canoga Avenue	Northbound exit and southbound entrance
		25.34	27		Signed as exits 27A (north) and 27B (south) northbound
		25.76	27C	Shoup Avenue	Northbound exit and southbound entrance
		26.45	28	Fallbrook Avenue	Southbound exit only
		26.86	28	Woodlake Avenue	Northbound exit and entrance
		27.36	29	Mulholland Drive, Valley Circle Boulevard
	Calabasas	28.29	30	Parkway Calabasas
		31.06	32	Las Virgenes Road – Malibu Canyon
		31.92	33	Lost Hills Road
	Agoura Hills	32.79	34	Liberty Canyon Road
		33.69	35	Chesebro Road – Agoura Hills
		35.04	36	Kanan Road
		36.18	38	Reyes Adobe Road
	Westlake Village	37.54	39	Lindero Canyon Road
Ventura VEN 0.00-R43.62	Thousand Oaks	0.70	40		South end of SR 23 overlap
		1.62	41	Hampshire Road
		3.02	43A	Rancho Road	Signed as exit 43B northbound
		3.11	43B		North end of SR 23 overlap; signed as exit 43A northbound
		4.06	44	Moorpark Road – Thousand Oaks
		5.05	45	Lynn Road
		6.19	46	Ventu Park Road – Newbury Park
		7.02	47A	Rancho Conejo Boulevard, Borchard Road	Signed as exits 47A (Rancho Conejo Boulevard) and 47B (Borchard Road) northbound
		7.89	47B	Wendy Drive – Newbury Park	Signed as exit 47C northbound
	Camarillo	10.74	50	Camarillo Springs Road – Camarillo Grove County Park
		12.30	52	Santa Rosa Road, Pleasant Valley Road
		13.75	53A	Flynn Road, Dawson Drive
		13.85	53B
		14.80	54	Carmen Drive – Camarillo
		15.89	55	Las Posas Road
		17.75	57	Central Avenue
	Oxnard	19.17	59	Del Norte Boulevard
		20.08	60	Santa Clara Avenue, Rice Avenue
		21.01	61	Rose Avenue
		22.01	62A
		22.73	62B		South end of SR 1 overlap
			63A	Ventura Road	Southbound exit only
	Ventura	R23.45	63B	Johnson Drive – Montalvo	Signed as exit 63 northbound
		R24.65	64	Victoria Avenue – Channel Island Harbor
		25.97	65	Telephone Road
		26.39	66A		Signed as exit 66 southbound; no southbound entrance
		26.72	66B	Main Street (US 101 Bus. north) – Ventura	Northbound exit and entrance
		28.45	68	Seaward Avenue
		29.45	69	Vista del Mar Drive, Sanjon Road	Northbound exit and southbound entrance
		30.15	70A	California Street, Ventura Avenue
		30.91	70B		Former US 399
		31.50	71	Main Street (US 101 Bus. south) – Ventura	Southbound exit and northbound entrance
	Solimar Beach	R32.70	72	State Beaches (SR 1 north)	North end of SR 1 overlap; northbound exit and southbound entrance
	Seacliff	R38.98	78	Seacliff (SR 1 south)	South end of SR 1 overlap
	Gap in freeway
		R43.57	83	Bates Road
Santa Barbara SB R0.00-90.99	Carpinteria	R0.63	84	, Lake Casitas
		1.61	85	Bailard Avenue
		2.64	86A	Casitas Pass Road	Signed as exit 86 northbound
		3.06	86B	Linden Avenue	Southbound exit and northbound entrance
		3.77	87A	Santa Monica Road	Signed as exit 87 northbound
			87B	Carpinteria Avenue	Southbound exit only
		R5.28	88	Padaro Lane, Santa Claus Lane
		R7.14	90	Padaro Lane – Summerland
		R8.26	91	Evans Avenue – Summerland
	Montecito	9.00	92	Sheffield Drive
		10.02	93	San Ysidro Road
	Santa Barbara	10.54	94A	Olive Mill Road, Coast Village Road	No northbound entrance
			94B	Hermosillo Drive	Northbound exit only
		11.41	94C	Cabrillo Boulevard (SR 225 west), Coast Village Road	Signed as exit 94B southbound
			95	(no name)	Southbound exit only
			95	Salinas Street	Northbound exit and entrance
		12.75	96A	Milpas Street	Former SR 144
		13.49	96B	Laguna Street, Garden Street
		R14.19	97	Bath Street, Castillo Street – Santa Barbara Harbor
		R14.76	98A	Carrillo Street – Downtown Santa Barbara	Signed as exit 98 southbound
		R15.26	98B	Arrellaga Street	Northbound exit and entrance
		R15.73	99A	Mission Street	Signed as exit 99 southbound
			99B	Pueblo Street	Northbound exit only
		16.55	100
		17.78	101A	La Cumbre Road, Hope Avenue
		18.38	101B	– Cachuma Lake
			102	El Sueno Road	Northbound exit and entrance
		20.06	103	Turnpike Road
	Goleta	21.15	104A	Patterson Avenue	Signed as exit 104 southbound
		21.41	104B	– Airport, UCSB	Northbound exit and southbound entrance
		22.53	105	Fairview Avenue
		23.72	107	Los Carneros Road
		24.77	108	Glen Annie Road, Storke Road
		26.91	110	Winchester Canyon Road, Hollister Avenue
	Short gap in freeway
		30.06	113	Dos Pueblos Canyon Road
	Short gap in freeway
		32.84	116	El Capitan Ranch Road
		33.85	117	El Capitan State Beach
		36.62	120	Refugio Road – Refugio State Beach
	North end of freeway
		44.82	128	Mariposa Reina	Interchange
				Gaviota State Beach
		47.19	Gaviota Gorge Tunnel (northbound only)
	South end of freeway
	Las Cruces	R48.85	132	, Vandenberg AFB	North end of SR 1 overlap
	Gap in freeway
	Buellton	R56.46	139	Santa Rosa Road
		R57.12	140A
		R57.55	140B	McMurray Road, Avenue of the Flags
	Gap in freeway
	Zaca	62.67	146	, Cachuma Lake
	Gap in freeway
		70.92	154	, Vandenberg AFB
	Gap in freeway
		78.69	161	(no name)
	Santa Maria	82.18	164	Clark Avenue – Orcutt
		84.34	167	Santa Maria Way (US 101 Bus. north)
		86.59	169	Betteravia Road – Sisquoc
		87.60	170	Stowell Road
	Santa Maria	88.60	171		South end of SR 166 overlap
		89.69	172	Donovan Road
		90.75	173
San Luis Obispo SLO 0.00-R69.32		0.81	175		North end of SR 166 overlap
		4.85	179	Tefft Street – Nipomo
		7.84	182	Thompson Road, Los Berros Road
	Gap in freeway
	Arroyo Grande	12.52	186	Traffic Way (US 101 Bus. north), Fair Oaks Avenue	No northbound entrance
		13.17	187A
		13.75	187B	Brisco Road, Halcyon Drive
	Pismo Beach	14.61	188	Oak Park Road
		15.58	189	4th Street, Five Cities Drive	Signed as exits 189 (4th Street) and 190A (Five Cities Drive) southbound
		16.40	190B	Price Street (US 101 Bus. north), Hinds Avenue	No northbound entrance; signed as exit 190 northbound
		16.88	191A		No southbound entrance
		17.76	191B	Shell Beach Road, Price Street (SR 1 south, US 101 Bus. south)	South end of SR 1 overlap
		R19.81	193	Spyglass Drive, Shell Beach Road
		R21.11	195	Avilla Beach Drive
		R22.29	196	San Luis Bay Drive – See Canyon, Avila Beach
		R24.30	198	Higuera Street
	San Luis Obispo	25.91	200A	Los Osos Valley Road	Signed as exit 200 southbound
			200B	Prado Road, Elks Lane	Northbound exit and entrance
		27.50	201
		28.07	202A	Marsh Street
		28.81	202B	Broad Street
		29.08	203A	Osos Street, Santa Rosa Street
		29.08	203B	, Hearst Castle	North end of SR 1 overlap
		29.40	203C	California Boulevard
		29.77	203D	Grand Avenue – Cal Poly	Northbound exit and southbound entrance
		29.99	204	Monterey Street	No southbound entrance
	Gap in freeway (Cuesta Grade)
	Santa Margarita	37.85	211
		42.27	216A	Santa Barbara Road	Signed as exit 216 southbound
			216B	San Diego Way	Northbound exit and southbound entrance
	Atascadero	44.01	218A	Santa Rosa Road
		44.84	218B	Curbaril Avenue
		45.57	219
		45.96	220A	Traffic Way (US 101 Bus. north)
		46.87	220B	San Anselmo Road
		48.33	222	Del Rio Road (US 101 Bus. south)
		49.32	223	San Ramon Road, Santa Cruz Road
	Templeton	50.64	224	Vineyard Drive (US 101 Bus. north)
		51.45	225	Las Tablas Road
		52.44	226	Main Street (US 101 Bus. south)
	Paso Robles	53.89	228	, Hearst Castle	South end of SR 46 overlap
		55.67	229	Spring Street (US 101 Bus. north)	Northbound exit and southbound entrance
			230	Pine Street	Southbound exit and entrance
			230	Paso Robles Street	Northbound exit only
		56.88	231A	16th Street	Southbound exit and northbound entrance
		57.92	231B		North end of SR 46 overlap; signed as exit 231 northbound
		58.76	232	Spring Street (US 101 Bus. south)	No southbound entrance
	Gap in freeway
	San Miguel	65.08	239A	San Miguel	Northbound exit and southbound entrance
		65.56	239B	10th Street	Signed as exit 239 southbound
		67.23	241A	San Miguel	Southbound exit and northbound entrance
		R67.71	241B	Camp Roberts	Signed as exit 241 northbound
Monterey MON R0.00-101.32		R0.84	244	Camp Roberts
		R2.15	245	East Garrison
		R7.94	251	Bradley
		R9.67	252
		R15.47	258	Alvarado Road
		R17.86	260	Los Lobos Road
		R21.99	263	Paris Valley Road – San Ardo
		R29.90	271	Paris Valley Road – Lockwood
	San Lucas	R32.02	273
		R37.31	278	Wild Horse Road
	King City	R39.77	281	First Street (US 101 Bus. north, CR G13, CR G15) – King City
		R40.72	282A	Canal Street
		R41.18	282B	Broadway (US 101 Bus. south) – King City
		R41.95	283
	North end of freeway
				Central Avenue
	South end of freeway
		52.66	293	Espinosa Road (US 101 Bus. north, CR G16) – Greenfield
	Greenfield	53.36	294A	Oak Avenue
		53.86	294B	Walnut Avenue
		54.79	295	Thorne Road (US 101 Bus. south) – Greenfield
	Gap in freeway
		60.40	301	Arroyo Seco Road
	Soledad	61.59	302
		62.70	303	Front Street (US 101 Bus. south)
		64.63	305	Camphora Gloria Road
		66.40	307	Soledad Correctional Facility
		69.37	310	Gloria Road (US 101 Bus. north) – Gonzales
		70.86	311	5th Street
		72.61	313	Old Stage Road (US 101 Bus. south) – Gonzales
		76.97	317	Chualar
	North end of freeway
		82.47		Abbott Street (US 101 Bus. north) – Spreckels	Interchange; northbound exit and southbound entrance
	South end of freeway
	Salinas	85.62	326A	Airport Boulevard
			326B	Fairview Avenue	Northbound exit only
		86.12	326C	Monterey Peninsula	Signed as exit 326B southbound
		86.82	327	John Street (SR 68)
		87.30	328
			329	North Main Street (US 101 Bus. north)	Northbound exit and southbound entrance
		R88.24	329	Main Street (SR 183, US 101 Bus. south) – Salinas	Southbound exit and northbound entrance
		R89.27	330	Laurel Drive
		R91.01	331	Boronda Road (US 101 Bus. south)
	North end of freeway
		R91.90		Russell Road	Interchange; northbound exit and entrance
		91.90		Espinosa Road	No northbound entrance
		95.44	336		Interchange; south end of SR 156 overlap
		96.14	337	San Miguel Canyon Road (CR G12)	Interchange
		100.39		Dumbarton Road to San Juan Road (CR G11) – Aromas, Watsonville	No northbound entrance
				San Juan Road (CR G11) – Aromas, Watsonville	No northbound exit
San Benito SBT 0.00-R7.52	South end of freeway
		3.01	345		North end of SR 156 overlap
		R4.90	347
		R6.49	349	Betabel Road, Y Road
	North end of freeway
Santa Clara SCL R0.03-52.55		3.16	353		Interchange
				Gavilan College	No left turn from US 101 north to Gavilan College
	South end of freeway
		R4.94	355	Monterey Street (US 101 Bus. north) – Gilroy
	Gilroy	R6.08	356		South end of SR 152 overlap
		R7.53	357		North end of SR 152 overlap
		R10.27	360	Masten Avenue
		R12.46	362	San Martin Avenue
		R15.07	365	Tennant Avenue
	Morgan Hill	R16.01	366	East Dunne Avenue – Morgan Hill
		R17.82	367	Cochrane Road (US 101 Bus. south)
	San Jose	R21.25	371	Coyote Creek Golf Drive
		R23.10	373	Bailey Avenue
		R26.78	377A		Signed as exit 377B southbound; no northbound entrance
		R27.00	377B	Silicon Valley Boulevard, Bernal Road	Signed as exit 377A southbound
		R28.61	378
		30.10	380	Hellyer Avenue
		31.00	381	Yerba Buena Road	Southbound exit is part of exit 382
		31.70	382	Capitol Expressway (CR G21)
		33.03	383	Tully Road
		34.55	385A	Story Road	Signed as exit 385 northbound
		34.87	385B		Signed as exit 384 northbound
		R35.76	386A
		R36.14	386B	McKee Road, Julian Street
		37.73	388A	Oakland Road, 13th Street	Former SR 238
		38.30	388		Signed as exits 388B (north) and 388C (south)
		38.80	389A	Old Bayshore Highway	Northbound exit and entrance
		39.29	389B	Brokaw Road, First Street	Signed as exit 389 southbound
		39.93	390		Southbound exit and northbound entrance
		40.70	391	Trimble Road, De la Cruz Boulevard – Santa Clara	Signed as exits 391A (Trimble Road) and 391B (De la Cruz Boulevard) southbound
	Santa Clara
		41.98	392	San Tomas Expressway, Montague Expressway (CR G4)
		42.73	393	Great America Parkway, Bowers Avenue
	Sunnyvale	43.85	394	Lawrence Expressway (CR G2)
		44.83	395	Fair Oaks Avenue	Signed as exits 395A (north) and 395B (south) southbound
		45.68	396A	Malthilda Avenue north to SR 237 east	Northbound exit and southbound entrance
		45.68	396B	Mathilda Avenue south – Sunnyvale	Signed as exit 396A southbound; former SR 85
		46.13	396B		Southbound exit and northbound entrance
		46.13	396C		Northbound exit and southbound entrance
	Mountain View	47.01	397	Ellis Street
		47.89	398A	Moffett Boulevard, NASA Parkway	Signed as exit 398 northbound
		48.10	398B		Southbound exit and northbound entrance
		48.60	399A	Shoreline Boulevard – Mountain View	Signed as exit 399 southbound
		48.97	399B	Old Middlefield Way	Northbound exit and southbound entrance
		49.61	400A	Amphitheatre Parkway, Rengstorff Avenue	Signed as exits 400A (Amphitheatre Parkway) and 400B (Rengstorff Avenue) northbound
		50.32	400C	San Antonio Road	Signed as exits 400B (north) and 400C (south) southbound
	Palo Alto
		52.01	402	Oregon Expressway (CR G3)
		52.17	402	Embarcadero Road
San Mateo SM 0.00-26.11	East Palo Alto	0.89	403	University Avenue (to SR 109)
		1.87	404	Willow Road (SR 114, to SR 84)	Signed as exits 404A (east) and 404B (west)
	Menlo Park
		3.59	406		South end of SR 84 overlap
	Redwood City	5.39	408		North end of SR 84 overlap
		6.62	409	Whipple Avenue– Redwood City
	San Carlos		411	Brittan Avenue	Southbound exit and entrance
		8.40	411	Holly Street, Redwood Shores Parkway – San Carlos
			412	Harbor Boulevard	Southbound exit and entrance
	Belmont	9.55	412	Marine Parkway, Ralston Avenue – Belmont	Former Legislative Route 214
	San Mateo	11.15	414A	Hillsdale Boulevard – Foster City
		11.90	414B
		11.90	414B	Fashion Island Boulevard	No northbound exit
		12.69	415	Kehoe Avenue	Northbound exit and entrance
		13.46	416	3rd Avenue	Former SR 92
		14.33	417A	Dore Avenue	Northbound exit
		14.33	417	Poplar Avenue	Southbound exit and entrance
		14.69	417B	Peninsula Avenue – Burlingame	Northbound exit and entrance
	Burlingame		419A	Anza Boulevard	Northbound exit and entrance
		16.58	419B	Broadway – Burlingame
	Millbrae	17.95	420	Millbrae Avenue – Millbrae
	San Bruno	19.12	422	San Francisco International Airport	Southbound exit is part of exit 423A
		R20.39	423A	San Bruno Avenue
		R20.72	423B
	South San Francisco	R20.72	423C	North Access Road  – North Cargo Area	Southbound exit is part of exit 423A
		21.69	424	South Airport Boulevard
		21.92	425A	Grand Avenue – Downtown South San Francisco	No southbound entrance
		22.71	425B	Oyster Point Boulevard
			425C	South San Francisco (Airport Boulevard)	Southbound exit and entrance
	Brisbane	23.39	426A	Brisbane, Cow Palace (Bayshore Boulevard)	Northbound exit only
		23.66	426B	Sierra Point Parkway, Marina Boulevard – Brisbane	Signed as exit 426 southbound; southbound exit and entrance are located north of northbound exit and entrance
San Francisco SF 0.00-11.18		0.03	429A	Tunnel Avenue – Candlestick Park
		0.77	429B	Third Street – Cow Palace
		1.11	429C	Paul Avenue	No northbound entrance; signed as exit 430A southbound
		1.77	430B	Silver Avenue	No northbound entrance
		1.98	430A		Northbound exit and southbound entrance
		1.98	430A		Signed as exit 431 southbound
		2.00	431	Alemany Boulevard, Bayshore Boulevard	No southbound exit
		2.92	432	Cesar Chavez Street, Potrero Avenue
		4.10	433A	Vermont Street	Northbound exit only
		4.24	433B		Signed as exit 433 southbound
			433C	Ninth Street – Civic Center	Northbound exit and southbound entrance
			434A	Duboce Avenue	Northbound exit and southbound entrance
			434B	Octavia Boulevard to Fell Street	Northbound exit and southbound entrance
		North end of freeway
		R5.07		Mission Street, Otis Street
				Market Street
		6.71		Van Ness Avenue, Lombard Street – Fisherman's Wharf
		7.80		Broderick Street, Lombard Street, Richardson Avenue – Presidio
		South end of freeway
				Presidio, Crissy Field	Northbound exit only
		L8.59	437	Marina Boulevard – Marina	Southbound exit and northbound entrance
		9.40	438		South end of SR 1 overlap
		9.71	439	25th Avenue – View Area, Presidio, Golden Gate NRA, Fort Point
		Golden Gate Bridge over Golden Gate
Marin MRN L0.00-27.63	Sausalito
				Vista Point	Northbound exit and entrance
		0.32	442	Alexander Avenue – Sausalito
		0.89	Waldo Tunnel under Waldo Grade
		1.52	443	Spencer Avenue, Monte Mar Drive
		2.48	444	Rodeo Avenue	No access across US 101
		3.33	445A	Sausalito, Marin City
		4.46	445B		North end of SR 1 overlap
	Strawberry		446	Seminary Drive
		5.70	447
	Corte Madera	7.37	449A	Paradise Drive, Tamalpais Drive	Signed as exit 449 northbound
		7.66	449B	Madera Boulevard	Southbound exit and entrance
		8.02	450A	Lucky Drive, Doherty Drive
	Larkspur	8.60	450B	Sir Francis Drake Boulevard – San Anselmo, Richmond Bridge, Kentfield
	San Rafael	9.63	451A	Andersen Drive	Southbound exit and entrance
		10.00	451	Francisco Boulevard to I-580 east – Richmond Bridge	Northbound exit only
		10.00	451B		Southbound exit and northbound entrance
		10.72	452	Central San Rafael
		12.19	454A	Lincoln Avenue	No northbound exit
		12.69	454B	North San Pedro Road	Signed as exit 454 northbound
		13.71	455	Freitas Parkway – Terra Linda
		14.71	456	Lucas Valley Road, Smith Ranch Road
		15.57	457	St. Vincent Drive – Marinwood
		16.64	458	Nave Drive, Alameda del Prado – Hamilton Field
		18.09	459	Ignacio Boulevard, Bel Marin Keys Boulevard, Entrada Drive – Hamilton Field
	Novato	18.94	460		Signed as exits 460A (SR 37) and 460B (South Novato Boulevard) northbound
		R20.19	462A	Rowland Boulevard (US 101 Bus. north)
		R21.11	462B	De Long Avenue – Downtown Novato
		R22.00	463	Atherton Avenue, San Marin Drive (US 101 Bus. south)
	North end of freeway
		26.90		San Antonio Road	No northbound entrance
Sonoma SON 0.00-R56.22				San Antonio Road	Interchange; no northbound exit
	South end of freeway
		2.94	472A	Petaluma Boulevard South (US 101 Bus. north)
	Petaluma	3.58	472B		South end of SR 116 overlap
		4.76	474	East Washington Street – Central Petaluma
		5.76	476	Old Redwood Highway, Petaluma Boulevard North (US 101 Bus. south) – Penngrove
		10.67	479	Railroad Avenue	Northbound exit and southbound entrance
	Cotati	12.00	481A	West Sierra Avenue – Cotati	Northbound exit and southbound entrance
		12.69	481B		North end of SR 116 overlap; signed as exit 481 southbound
	Rohnert Park	13.88	483	Rohnert Park Expressway
		15.02	484A	Golf Course Drive, Wilfred Avenue	Signed as exit 484 southbound
		15.53	484B	Santa Rosa Avenue (US 101 Bus. north)	Northbound exit and southbound entrance
		16.54	485	Todd Road
		18.49	487	Yolanda Avenue, Hearn Avenue
		19.00	488A	Baker Avenue, Santa Rosa Avenue, Corby Avenue
	Santa Rosa	19.66	488B
		20.09	489	Downtown Santa Rosa
		20.74	490	College Avenue
		21.74	491A	Steele Lane, Guerneville Road	Signed as exit 491 southbound
		22.52	491B	Bicentennial Way	Northbound exit and southbound entrance
		22.81	492	Hopper Avenue, Mendocino Avenue (US 101 Bus. south), Old Redwood Highway
		24.86	494	River Road – Guerneville, Calistoga
		25.90	495A	Fulton Road – Fulton
		26.33	495B	Airport Boulevard
		27.62	496	Shiloh Road
		29.35	498	Windsor
		30.67	499	Arata Lane	Northbound exit and southbound entrance
		33.48	502	Healdsburg Avenue, Old Redwood Highway
	Healdsburg	34.55	503	Central Healdsburg	Northbound exit and southbound entrance
		34.88	504	Westside Road – Guerneville	Southbound exit and northbound entrance
		36.27	505	Dry Creek Road – Healdsburg
		R38.56	507	Lytton Springs Road, Alexander Valley Road
		R40.03	509	Independence Lane
	Geyserville	R41.43	510	Geyserville Avenue to SR 128 east – Geyserville
		R43.37	512		South end of SR 128 overlap
		R47.85	517	Asti
		R49.05	518	Dutcher Creek Road – Stewarts Point
		R50.43	519	South Cloverdale Boulevard (US 101 Bus. north, SR 128 Bus. west)
	Cloverdale	R51.62	520	Citrus Fair Drive
		R53.40	522		North end of SR 128 overlap
Mendocino MEN R0.10-T106.80		0.48	525	Geysers Road
	North end of freeway
				Old River Road
	Hopland	10.89
	South end of freeway
		19.68	544	Burke Hill Drive
		20.71	545	Cox-Shrader Road
		R21.59	546
	Ukiah	R23.45	548A	Talmage (SR 222)
		R24.06	548B	Gobbi Street
		R24.53	549	Perkins Street, Vichy Springs Road – Central Ukiah
		R26.16	551	North State Street – Ukiah
		27.41	552	Lake Mendocino Drive
		30.43	555A	Calpella
		30.83	555B		South end of SR 20 overlap
		R32.63	557	West Road
	North end of freeway
	Willits	46.36			North end of SR 20 overlap
	Longvale	59.31
	Laytonville	69.49		Branscomb, Dos Rios
	South end of freeway
		R84.69	609		Former US 101 north
	South Leggett	R89.57	614	South Leggett (SR 271)	Former US 101
	North end of freeway
	Leggett	T91.25			Former SR 208 south
	South end of freeway
	Reynolds	R101.89	625		Former US 101
	Piercy	R103.81	627	Piercy (SR 271)	Former US 101
Humboldt HUM T0.00-R137.44	North end of freeway
	Cooks Valley	T0.08			Former US 101 south
	South end of freeway
	Benbow	R8.60	636	Benbow
	Garberville	R11.13	639A	Sprowel Creek Road (US 101 Bus. north) – Garberville	No northbound entrance
		R11.50	639B	Garberville, Redway	No southbound entrance
		R14.31	642	Redwood Drive (US 101 Bus. south) – Redway
		R17.91	645	Avenue of the Giants (SR 254), Hooker Creek Road – Phillipsville
		R22.44	650	Miranda, Phillipsville
		25.01	653	Salmon Creek Road
	Myers Flat	27.94	656	Myers Flat (SR 254)
		33.22	661	Weott
		35.70	663	South Fork, Honeydew (SR 254)
		39.16	667A	Avenue of the Giants (SR 254)	Southbound exit only
		R39.67	667	Redcrest, Holmes
		R43.32	671	Pepperwood, Redcrest, Holmes
		R45.90	674	Avenue of the Giants (SR 254), Jordan Road – Pepperwood
		R47.95	676	Stafford Road
	Gap in freeway
		R51.84	679	Rio Dell, Scotia (SR 283, US 101 Bus. north)
	Rio Dell	R52.60	680	Davis Street
		R53.38	681	Wildwood Avenue (US 101 Bus. south) – Rio Dell
	North end of freeway
	Alton	57.69
	Rohnerville	58.69		Drake Hill Road
		South end of freeway
	Fortuna	59.50	687	Kenmar Road (US 101 Bus. north) – Fortuna
		60.49	688	12th Street
	Fortuna	61.53	689	Main Street (US 101 Bus. south)
		62.23	690	Palmer Boulevard
	Fernbridge	63.10	691	Fernbridge, Ferndale (to SR 211)	Northbound exit and southbound entrance
		64.30	692	Loleta, Fernbridge, Ferndale (SR 211)
		65.95	694	Loleta Drive
		68.21	696	Hookton Road – Loleta
	Eureka	70.61	698	College of the Redwoods
		72.03	699	Fields Landing
		72.88	700	King Salmon Avenue
		73.72	701	Humboldt Hill
		74.77	702	Herrick Avenue, Elk River Road
		North end of freeway
		79.17
				Jacobs Avenue
		82.68		Indianola Cutoff
	Arcata	83.92		Bayside Cutoff
		South end of freeway
		85.03	712	South G Street	Southbound exit and entrance
		85.83	713
		86.50	714A	14th Street – Humboldt State University	Northbound exit and southbound entrance
		86.94	714B	Sunset Avenue – Arcata, Humboldt State University	Signed as exit 714 southbound
		88.27	716A
		88.80	716B	Giuntoli Lane, Janes Road
		R90.13	718	Central Avenue (US 101 Bus. north), North Bank Road (SR 200) – McKinleyville
	McKinleyville	R91.47	719	School Road
		R93.00	721	Murray Road
		R93.85	722	Arcata-Eureka Airport
		R95.62	723	North Central Avenue (US 101 Bus. south) – McKinleyville
		R97.02	725	Crannell Road
		98.07	726A	Westhaven Drive	Northbound exit and southbound entrance
		98.36	726B	6th Avenue – Westhaven	Signed as exit 726 southbound
	Trinidad	100.71	728	Trinidad
		R103.37	731	Seawood Drive
		R106.06	734	Patricks Point Drive
	North end of freeway
		122.25		Bald Hill Road – Lady Bird Johnson Grove
South end of freeway
	R126.09	753	Newton B. Drury Scenic Parkway	Former US 101 north
Del Norte DN M0.00-46.49		R0.15	765	Newton B. Drury Scenic Parkway	Former US 101 south
		R3.56	768	Klamath Beach Road (CR D8)
	Klamath	R4.64	769
	North end of freeway
	Requa	8.18		Minot Creek Road, Requa Road
	Crescent City			Elk Valley Road (CR D2), Huston Street
		25.84		Elk Valley Road (CR D2) – Elk Valley Rancheria
		27.01
				Parkway Drive to Washington Boulevard	Interchange; northbound exit and entrance
	South end of freeway
		R27.87	791	Washington Boulevard (CR D1)	Southbound exit and northbound entrance
		R30.81	794	– Grants Pass	Northbound exit and southbound entrance
	North end of freeway
		31.19		Elk Valley Cross Road to US 199 – Grants Pass
				Lake Earl Drive (CR D3) – Pelican Bay State Prison
		36.26
	Smith River	39.83		Fred D. Haight Drive (CR D4) – Smith River
				Sarina Road, Ocean View Drive (CR D5)
		46.49	Oregon state line

References

1. California Highways Highway Statistics
2. CA Codes (shc:250-257)
3. California Department of Transportation, State Truck Route List (XLS file), accessed February 2008
4. California Department of Transportation, Log of Bridges on State Highways, July 2007
5. California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
6. California Department of Transportation, California Numbered Exit Uniform System, U.S. Route 101 Freeway Interchanges, Retrieved on 2009-02-07.

External links

Drive the 101 - Contains historical information.