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Interstate 5 in Washington (I-5) is a highway in the U.S. state of Washingtonmarker that extends from its border with Oregonmarker to its border with Canada. Serving the cities of Vancouvermarker, Kelsomarker, Chehalismarker, Centraliamarker, Olympiamarker, Tacomamarker, Seattlemarker, Everettmarker, Mount Vernonmarker, and Bellinghammarker, it is the main route between Portland, Oregonmarker, and Vancouvermarker, British Columbiamarker.

It is the only interstate to traverse the whole north-south length of Washington, but the state highways U.S. Route 97 and U.S. Route 395 do also. I-5 is also the only north-south primary interstate highway in Washington. The road is the busiest in the state; an estimated 240,000 motorists use the road daily. The second busiest is I-405 at 201,000.

Route description

Vancouver to Tumwater

The Interstate Bridge carries I-5 over the Columbia River from Portland to Vancouver.

I-5 enters Washington at the Interstate Bridgemarker over the Columbia River between Portlandmarker and Vancouvermarker. It initially heads north through Vancouver and intersects SR 14, the first segment of SR 501, and SR 500 until the interchange with I-205 in Salmon Creekmarker, where the freeway begins a turn to the northeast. I-5 closely follows the alignment of old U.S. Route 99, and in some locations the US 99 alignment has become I-5. The interstate passes the Vancouver branch of the Washington State Universitymarker. Southeast of Ridgefieldmarker, the highway intersects SR 502 and the second segment of SR 501 before continuing north along the Columbia River to Woodlandmarker.

In Woodland, I-5 intersects SR 503 and starts to curve northwest towards Longviewmarker and Kelsomarker. At Longview Junction, east of Longview, I-5 intersects SR 432 and continues north to Kelso. Here it intersects SR 4, formerly US 830, and SR 431 before curving northeast towards Castle Rockmarker. In Castle Rock, the freeway intersects SR 411, and SR 504, which connects I-5 with Mount St. Helensmarker, Spirit Lakemarker, and Paradisemarker. From Castle Rock, the highway goes north to Napavinemarker and intersects SR 506 and SR 505 before becoming concurrent with US 12 and continuing north to intersect SR 508. After the intersection, I-5 and US 12 go into Chehalismarker, where the highway intersects SR 6.

After leaving Chehalismarker, I-5/US 12 enters Centraliamarker and intersects SR 507 before splitting from US 12 north of the city. As the freeway continues north towards Olympiamarker, it intersects SR 121, which connects the highway with Millersylvania State Parkmarker and loops back to I-5. As the freeway enters Tumwatermarker, it passes the Olympia Airportmarker before intersecting the northern terminus of US 101.

Tumwater to Renton

As I-5 leaves the US 101 interchange, the highway curves east and forms the southern boundary of Olympiamarker. The highway also goes across Capitol Lakemarker and intersects Capitol Way, which connects the freeway to the Washington State Capitolmarker. After leaving Olympia, I-5 goes in a northeastern direction into Laceymarker, where it intersects SR 510. After passing Nisquallymarker, the highway enters Du Pont, where it enters Fort Lewismarker. After passing Camp Murraymarker and American Lake, the freeway comes to the proposed western terminus of SR 704, passes McChord Air Force Basemarker, and enters Lakewoodmarker.

In Lakewood, I-5 intersects SR 512 and continues into Tacomamarker, where the freeway passes the Tacoma Mall and intersects major highways, such as SR 16, I-705, SR 7, and SR 167 before going east into Fifemarker. In Fife, the highway intersects SR 99, a small portion of US 99 through the Puget Soundmarker region, and then enters Federal Waymarker. Here the freeway intersects the western terminus of SR 18, which has been proposed to be renumbered to I-605 after being upgraded to Interstate standards.

After also intersecting SR 516, the highway passes Angle Lakemarker, the Seattle-Tacoma International Airportmarker, and Westfield Southcenter before going into an interchange with I-405 and SR 518. SR 518 connects I-5 to the Seattle-Tacoma International Airport, and I-405 bypasses I-5 through Seattlemarker.

Renton to Shoreline

From the I-405/SR 518 interchange, I-5 goes north and intersects SR 599, which connects I-5 to SR 99, and SR 900. From the interchanges, the highway passes Boeing Fieldmarker and the West Seattle Bridgemarker before having a large interchange with I-90. After the interchange, I-5 intersects SR 519 and enters Seattle.

In downtown Seattle, I-5 becomes a tunnel passing under the Washington State Convention and Trade Centermarker and Freeway Park. Once I-5 begins to rise from the tunnel, it passes over the I-5 Colonnade and then intersects the western terminus of SR 520, which goes to Bellevuemarker via the Evergreen Point Floating Bridgemarker. From the interchange with SR 520, the freeway goes north along the Ship Canal Bridgemarker over the Lake Washington Ship Canalmarker and passes the University of Washingtonmarker before entering Northgate.

Within the neighborhood of Northgate, the highway intersects SR 522 and merges with the I-5 express lanes at the Northgate Mallmarker. From the Northgate Mall, I-5 goes north into Shorelinemarker and intersects SR 523 and passes a King County Metro Transit base before intersecting SR 104 and entering Mountlake Terracemarker.

Seattle express lanes

Interstate 5 has of reversible express lanes within Seattlemarker. The express lanes begin after the Yesler Way bridge and tunnel under the northbound lanes of I-5 and intersect Cherry Street/Columbia Street. From the interchange, the express lanes intersect Mercer Street and then cross the Ship Canal Bridgemarker. The express lanes are on the lower deck below the lanes of I-5. Near the end of the bridge is a reversible ramp that accesses Northeast 42nd Street. After the bridge ends, the express lanes continue northbound and intersect with Ravenna Boulevard, Lake City Way, and Northeast 103rd Street/1st Avenue Northeast. Finally, the lanes merge with I-5 in Northgate just north of the Northgate Mallmarker.

The express lanes are open to all traffic, however, some ramps are designated for HOV vehicles only to assist with traffic flow and mitigate constrained space. These ramps include Cherry Street/Columbia Street/5th Avenue, Ravenna Boulevard, and Pike Street/Downtown Seattle Transit Tunnelmarker. The express lanes carry northbound traffic from 12pm to 11pm Monday through Friday and 2pm to 11pm Saturday and Sunday. They carry southbound traffic from 5 am to 11am Monday through Friday and from 7am to 1pm Saturday and Sunday. The express lanes are closed from 11pm to 5am from Monday to Friday and 11pm to 7am on Saturday and Sunday. The I-5 express lanes are closed at night because residents near the Ship Canal Bridgemarker wanted noise reduced at night. Studies conducted by WSDOT concluded that closing the lanes at night reduces noise by seven to ten decibels. This schedule is sometimes altered to accommodate high volumes of traffic before and after major events in the city or to allow for maintenance or repairs.

Shoreline to Everett

After leaving Shorelinemarker and intersecting SR 104, I-5 enters Snohomish Countymarker and Mountlake Terracemarker. From the interchange, the highway passes Lake Ballinger and intersects SR 524 before reaching the Alderwood Mall. Next to the mall, the freeway intersects SR 525 and I-405. From the interchange, I-5 passes Martha Lakemarker, intersects SR 96, and passes Silver Lake before reaching the interchange between I-5, SR 99, SR 526, and SR 527 near the Everett Mallmarker. SR 99 is part of Old US 99, SR 526 connects I-5 to the Boeing Everett Factorymarker, and SR 527 connects Bothellmarker with Everettmarker.

After leaving the interchange, I-5 intersects 41st Street at a single-point urban interchange, the only one in the area. From the interchange, the freeway intersects SR 529 and then SR 529 Spur and US 2.

Everett to Mount Vernon

After leaving downtown Everettmarker and the US 2/SR 529 Spur interchange, I-5 goes north across the Snohomish River and curves northeast to an interchange with SR 529. North of the interchange, the freeway enters Marysvillemarker and intersects SR 528. The highway passes the Tulalip Resort Casino at Quil Ceda, commonly known as the Quil Ceda Creek Casino, the Marysville Water Towermarker, Quil Ceda Village, the Tulalip Resort Casino and Tulalip Hotel, and Lakewood Crossing before intersecting SR 531 and leaving Marysville. From the Marysville City limits, I-5 passes Smokey Pointmarker and goes northwest to Island Crossing, where the highway intersects SR 530, which connects the freeway to Arlingtonmarker, Darringtonmarker, and Rockportmarker.

After the interchange, I-5 travels over the Stillaguamish River and passes Silvanamarker before intersecting SR 532, which goes west to Stanwoodmarker and Camano Islandmarker. As the highway curves northwest, the freeway enters Skagit Countymarker. Once in Skagit County, I-5 goes into Conwaymarker, where it intersects SR 534, which goes east to serve Big Lakemarker. From Conway, the freeway goes north into Mount Vernonmarker, where I-5 intersects SR 536, which serves as a shortcut to Anacortesmarker, via SR 20 and SR 20 Spur.

Mount Vernon to Blaine

After leaving downtown Mount Vernon, the freeway intersects SR 538, which serves the Skagit Valley College and Clear Lakemarker (via SR 9). After the interchange, the highway crosses the Skagit Rivermarker and enters Burlingtonmarker. After passing the Cascade Mall, I-5 intersects SR 20, which goes west to Anacortesmarker (via SR 20 Spur), Deception Passmarker, Whidbey Islandmarker, and Discovery Baymarker and SR 20 goes east to Okanoganmarker, Omakmarker, and Newportmarker. The freeway also intersects SR 11, which serves Edisonmarker, Bowmarker, Samish Island, and Bellinghammarker.

From the interchange, I-5 travels north and curved west on the shoreline of Lake Samishmarker north of Algermarker, which is also the point where the freeway enters Whatcom Countymarker. After traveling west, I-5 curves north again and intersects SR 11 before entering Bellingham. In Bellingham, the highway intersects SR 542, which goes to Mount Bakermarker, and SR 539, which goes to Lyndenmarker and British Columbiamarker. The freeway passes the Bellis Fair Mall, Bellingham International Airportmarker, and Ferndalemarker before intersecting SR 548, which serves Blainemarker. Once in Blaine, I-5 intersects SR 543, which leads to the truck and freight border crossing. The freeway then intersects SR 548 again and then crosses the Canadian border into British Columbiamarker as Highway 99 at the Peace Archmarker.


As part of the state's first connected state highway system, the Washington State Legislature designated the Pacific Highway between Vancouvermarker and Blainemarker in 1913. : "A highway starting at the international boundary line at Blaine, Washington; thence southerly by the most feasible route through the cities of Bellingham, Mount Vernon, Everett, Seattle, Renton, along the easterly side of the White River Valley through Kent, Auburn, Tacoma, Olympia, Tenino, Centralia, Chehalis, to the southern boundary line at the city of Vancouver, Washington, to be known as The Pacific Highway." The State Highway Board selected a route that would connect the main cities of Western Washington, which were Vancouvermarker, Olympiamarker, Tacomamarker, Seattlemarker, Everettmarker, and Bellinghammarker.State Highway Board, Road Map of Washington Showing Main Traveled Roads, 1912 In 1923, by which time the entire road had been improved, the highway became State Road 1 (Primary State Highway 1 after 1937), but retained its name. : "A primary state highway, to be known as State Road No. 1 or the Pacific Highway, is established as follows: Beginning at the international boundary line at Blaine in the County of Whatcom; thence by the most feasible route in a southerly direction through the cities of Bellingham, Mt. Vernon, Everett, Seattle, Tacoma, Olympia, Chehalis, Kelso and Vancouver to the interstate bridge over the Columbia River between Vancouver and Portland." By that time, most of the route of Interstate 5 became US 99, which was established in 1926.Department of Highways, Highway Map: State of Washington, Revised to April 1, 1933Department of Highways, Highways of the State of Washington (Rand McNally), 1939

Later in 1956, President Dwight D. Eisenhower signed the Federal-Aid Highway Act of 1956 which started the construction of Interstate Highways. In 1968, US 99 was removed from the system entirely, a year before the last portion of Interstate 5 opened on November 14, 1969. Legally, the Washington section of I-5 is defined at Washington Revised Code § 47.17.020. Several projects are currently ongoing and have been completed in the recent years on I-5.

Kelso to Centralia

the past two decades, parts of the interstate have been periodically inundated by floodwaters as a result of area storms. Floods in November 1990, February 1996, December 2007, and January 2009 each caused temporary closures of I-5 between the Kelso-Longview and Chehalis-Centralia areas. The causes of this problem, as noted by the United States Army Corps of Engineers, are attributable to "decades of clear-cut logging, modifications of waterways, and destruction of natural flood control features within the Chehalis River basin."

The December 3, 2007, flood closed a section of the interstate for four days. The Washington State Department of Transportation recommended a detour between Portlandmarker and Seattlemarker, by way of I-90, I-82, and I-84, adding to the trip.

The January 7, 2009 flood closed a section of the interstate for several days. The Washington State Department of Transportation was unable to offer a detour since all three main east/west passes were also closed due to severe mudslide and avalanche danger.


Interstate 5 cutting through the Seattle skyline

South of the Ship Canal Bridge Interstate 5 separates the Eastlake and Cascademarker neighborhoods from the Capitol Hillmarker neighborhood, and separates Downtown Seattlemarker from the Capitol Hill and First Hill neighborhoods. Its construction necessitated the demolition of significantly developed areas and cut off walking commutes to downtown for many First Hill residents, who "were by far the most vociferous critics of the proposed route," but far from the only ones. Architect Paul Thiry said in the early 1970s, "It was with the Freeway, cutting through the very heart of the city, that Seattle began taking one of its wrong turns and started to lose its identity as a city." He proposed a lid extending from Columbia Street north to Olive Way, roughly the entire length of downtown.

Among the buildings torn down in the Downtown-First Hill area to build the freeway was the Hotel Kalmar at Sixth Avenue and James Street (built 1881 as the Western Hotel, demolished 1962), the last of Seattle's pioneer-era hotels, predating the Great Seattle Fire, and Seattle's then-oldest public building, the Seventh Avenue Fire Hall (built 1890, demolished c. 1962).

In the years since the freeway's construction, Seattle has made several efforts to stitch back together pedestrian routes disrupted by the freeway, achieving part of Thiry's proposed "lid". The most visible of these efforts are Freeway Park (opened 1976), built as a lid over the freeway and connecting Downtown to First Hill, and the Washington State Convention and Trade Centermarker (built 1982-1988) adjacent to Freeway Park, also bridging the freeway. The I-5 Colonnade mountain bike park (opened 2007) uses the freeway as a roof and reconnects Eastlake to Capitol Hill.

On Interstate 5, the only planned improvement on the express lanes is a direct connection to the future SR 520 HOV lanes, to be constructed as part of the Evergreen Point Floating Bridgemarker replacement project.

Signage for Seattle and Vancouver in Northwestern Washington.

Seattle to Everett

The section between Seattle and Everett was opened on February 3, 1965 by Miss Sno-King Rose Clare Menalo of Meadowdale High School.

Everett to Mount Vernon

The portion of I-5 from US 2 / SR 529 Spur in Everett to SR 528 in Marysville opened at a ribbon-cutting ceremony on May 14, 1969 by Devvie Herivel, Miss Everett, and Katherine Smith, Miss Marysville. This was the last portion of Interstate 5 from California to Canada that was opened, free of traffic lights and draw bridges. The stretch of I-5 from Marysville to Mount Vernon was already opened as a 4-lane divided highway without overpasses.

Exit list

County Location Mile # Destinations Notes
Clarkmarker Vancouvermarker 0.41 1A
0.45 1B 6th Street – Vancouver City Centermarker Northbound exit and southbound entrance
1.05 1C , Port of Vancouver
1.58 1D 4th Plain Boulevard
2.35 2
3.07 3 Northeast Highway 99, Main Street – Hazel Dell Former US 99
4.36 4 Northeast 78th Street
5.39 5 Northeast 99th Street
7.24 7 Northeast 134th Street, WSU Vancouver Southbound exit is via I-205
7.48 7 -Salemmarker Southbound exit and northbound entrance
9.51 9 Northeast 179th Street - Clark County Fairgrounds
11.20 11 Northbound Rest Area
Ridgefieldmarker 14.21 14
16.80 16 Northwest La Center Road – La Centermarker
Cowlitzmarker Woodlandmarker 21.08 21
22.72 22 Dike Access Road
27.70 27 Todd Road – Port of Kalama
Kalamamarker 29.84-
30 Kalamamarker
32.28 32 Kalama River Road
Kelsomarker 36.97 36
39.88 39
40.77 40 Former SR 431
42.73 42 Ostrander Road, Pleasant Hill Road
46.20 46 Headquarters Road, Pleasant Hill Road
Castle Rockmarker 48.04 48
49.91 49
52.72 52 Barnes Drive, Toutle Park Road
Lewismarker 57.41 57 Jackson Highway, Barnes Drive
59.27 59
60.98 60 Toledo Vader Road (SR 506 west) Former SR 505 south
63.49 63 Former SR 603
68.48 68 South end of US 12 overlap
Napavinemarker 71.12 71
72.85 72 Rush Road
Chehalismarker 74 Labree Road
76.62 76 13th Street
78.04 77
79.15 79 Chamber Way
Centraliamarker 81.74 81
82.80 82 Harrison Avenue, Factory Outlet Way
Thurstonmarker 88.40 88 North end of US 12 overlap; signed as exits 88A (Tenino) and 88B (US 12) northbound
95.28 95
99.35 99
Tumwatermarker 101.37 101 Tumwater Boulevard – Olympia Airportmarker
102.86 102 Trosper Road – Black Lake
104.05 103 Deschutes Way, 2nd Avenue No southbound entrance
104.39 104
Olympiamarker 105.52 105A State Capitolmarker, Olympia City Centermarker Signed as exit 105 southbound
105.82 105B Port of Olympia Signed as exit 105 southbound
107.52 107 Pacific Avenue
Laceymarker 108.46 108A Sleater-Kinney Road south No northbound entrance; signed as exit 108 southbound
108.46 108B Sleater-Kinney Road north No northbound entrance; southbound exit is via exit 109
108.96 108C College Street Northbound exit only
109.19 109 Martin Way
112.01 111
114.36 114 Nisquallymarker, Old Nisqually
Piercemarker 116.77 116 Mounts Road – Old Nisqually
DuPontmarker 118.02 118 Center Drive
119.07 119 Steilacoom-DuPont Road
120.93 120 Fort Lewismarker, North Fort Lewismarker
Lakewoodmarker 122.74 122 Berkeley Street
123.64 123 Thorne Lane Proposed SR 704
124.70 124 Gravelly Lake Drive
125.92 125 Bridgeport Way – McChord AFBmarker
127.54 127
128.98 128 South 84th Street Southbound exit is via exit 129
Tacomamarker 129.65 129 South 72nd Street
130.75 130 South 56th Street, Tacoma Mall Boulevard
131.89 132 South 38th Street – Tacoma Mall
132.32 132
133.76 133
134.93 134 Portland Avenue Southbound exit is via exit 135
135.09 135
Fifemarker 136.15 136 20th Street East – Port of Tacoma Signed as exits 136A (20th Street) and 136B (Port of Tacoma) northbound
137.51 137
Kingmarker Federal Waymarker 142.06 142 Signed as exits 142A (east) and 142B (west)
143.89 143 South 320th Street – Federal Waymarker
144.08 South 317th Street HOV only
Kentmarker 146.87 147 South 272nd Street
149.23 149 Signed as exits 149A (east) and 149B (west) northbound
SeaTacmarker 151.24 151 Military Road, South 200th Street
152.32 152 South 188th Street, Orillia Road South
Tukwilamarker 154.19 153 Southcenter Parkway – Southcenter Mall Northbound exit and southbound entrance
154.46 154 Signed as exits 154A (I-405) and 154B (SR 518) southbound
154.71 154B Southcenter Boulevard – Southcenter Mall Southbound exit and northbound entrance
156.00 156
157.40 157
158.07 158 Boeing Access Road, East Marginal Way, Airport Way Former SR 181
Seattlemarker 161.27 161 Swift Avenue, Albro Place
162 Corson Avenue, Michigan Street
163.03 163A Columbian Way, West Seattle Bridgemarker Signed as exit 163 northbound
163.54 163B Forest Street, 6th Avenue South Southbound exit only
164 Airport Way Southbound exit only
164.55 164A Signed as exit 164 southbound
164.55 164B Signed as exit 164 southbound
164.68 164 Dearborn Street Signed as exit 164A northbound; no southbound entrance
165.35 Express Lanes Northbound exit and southbound entrance
165.38 165A James Street Signed as exit 164A northbound
165.63 164A Madison Street – Convention Centermarker Northbound exit only
165.75 165 Seneca Street Northbound exit and southbound entrance
165.81 165B Union Street Southbound exit and northbound entrance
166.26 166 Olive Way Northbound exit and entrance
166.42 166 Stewart Street, Denny Way Southbound exit and entrance; express lane exit/entrance
167 Mercer Street – Seattle Centermarker Southbound exit and northbound entrance; express lane exit/entrance
167.73 168A Lakeview Boulevard Northbound exit and southbound entrance
168.12 168B
168.18 168A Boylston Avenue, Roanoke Street Southbound exit and northbound entrance
169.44 169 Northeast 45th Street
169.69 169 Northeast 50th Street
170.31 170 Ravenna Boulevard, Northeast 65th Street Northbound exit and southbound entrance
170.70 171 Northeast 71st Street, Northeast 65th Street Southbound exit and northbound entrance
170.87 171 Northbound exit and southbound entrance
171.56 172 North 85th Street, Aurora Avenue North (SR 99), Northeast 80th Street
172.58 Express Lanes Southbound exit and northbound entrance
172.82 173 1st Avenue Northeast, Northgate Way
173.89 174 Northeast 130th Street, Roosevelt Way Northbound exit and southbound entrance; former SR 513
174.64 175
175.58 Metro Transit Base Transit Base traffic only
176.19 176 Northeast 175th Street – Shorelinemarker
177.81 177
Snohomishmarker Mountlake Terracemarker
178.33 178 236th Street Southwest – Mountlake Terracemarker Northbound exit and southbound entrance
179.35 179 220th Street Southwest – Mountlake Terracemarker
Lynnwoodmarker 180.69 46th Avenue West (Lynnwood Transit Center) HOV only
180.77 181A Northbound exit and southbound entrance
181.59 181B Signed as exit 181 southbound
182.67 182
182.67 182 Northbound exit and southbound entrance
183.96 183 164th Street Southwest
184.21 Ash Way Northbound exit and southbound entrance (buses only)
186.49 186
Everettmarker 187.80 112th Street Southeast HOV only
189.37 189 , Whidbey Island Ferry
192.51 Broadway Northbound exit only (HOV only)
192.72 192 41st Street, Evergreen Way
193.69 193 Northbound exit and southbound entrance
193.98 194
194.08 194 Southbound exit and northbound entrance
194.87 195 Marine View Drive – Port of Everett Northbound exit and southbound entrance
198.33 198 Southbound exit and northbound entrance
199.17 199
200.84 200 88th Street Northeast, Quil Ceda Way
202.52 202 116th Street Northeast
Arlingtonmarker 206.13 206
207 Smokey Point Safety Rest Areas Northbound Rest Area contains historic 'drive-thru' tree.
208.72 208
210.36 210 236th Street Northeast
212.71 212
215.09 215 300th Street Northwest
Skagitmarker 218.61 218 Starbird Road
221.13 221 Former SR 530
224.00 224 Old Highway 99 South Northbound exit and southbound entrance; former US 99
225.19 225 Anderson Road
Mount Vernonmarker 226.45 226
227.79 227
Burlingtonmarker 228.93 229 George Hopper Road
230.20 230
231.27 231
232.89 232 Cook Road – Sedro-Woolleymarker
236.45 236 Bow Hill Road – Bowmarker, Edisonmarker
240.99 240 Algermarker
Whatcommarker 242.92 242 Nulle Road – South Lake Samishmarker
246.30 246 North Lake Samishmarker
Bellinghammarker 250.79 250 - Alaska Marine Highway
252.14 252 Samish Way – Western Washington Universitymarker
253.03 253 Lakeway Drive
253.85 254 Iowa Street, Ohio Street, State Street
254.88 255
256.27 256 Signed as exits 256A (SR 539) and 256B (Bellis Fair-Mall Parkway) northbound, two southbound onramps
257.04 257 Northwest Avenue
257.72 258 Bakerview Road – Bellingham International Airportmarker
260.19 260 Slater Road – Lummi Islandmarker
Ferndalemarker 262.63 262 Main Street – Ferndale City Centermarker
263.52 263 Portal Way
266.04 266
270.30 270 Birch Baymarker, Lyndenmarker
Blainemarker 274.23 274 Peace Portal Drive – Semiahmoo Northbound exit and southbound entrance
275.21 275 – Truck Customs Northbound exit and southbound entrance (Pacific Border Crossing, continues north as 176th Street in Surrey BCmarker)
276.26 276 , Peace Arch State Parkmarker
276.62 Canadian border, continues north as BC Highway 99

Downtown Seattle express lanes

The entire route is in Seattlemarker, King Countymarker.
Mile Destinations Notes
165.29 South end of express lanes
165.62 5th Avenue, Columbia Street Southbound exit and northbound entrance (HOV only)
166.49 Pike Street (Metro Transit Tunnelmarker) Southbound exit and northbound entrance (HOV only)
166.63 Stewart Street - Seattle City Centermarker Southbound exit and northbound entrance

Mercer Street Southbound exit and northbound entrance
168.96 Northeast 42nd Street – University of Washingtonmarker Northbound exit and southbound entrance
169.66 Ravenna Boulevard Southbound entrance only (HOV only)
170.54 Northbound exit and southbound entrance
172.07 Northeast 103rd Street, 1st Avenue Northeast Northbound exit and southbound entrance
172.43 , Vancouver, BC North end of express lanes


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