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The Washburn Tunnel is a two-lane underwater motor-vehicle tunnel connecting Galena Parkmarker and Pasadenamarker, two suburbs of Houstonmarker, Texasmarker. Completed in 1950, it travels north-south underneath the Houston Ship Channelmarker. It was named after Harris County, Texasmarker Auditor Harry L. Washburn.Merritt_Chapman and Scott Corporation of New York engineered the $7 million project. First, a trench 90x40 feet had to be dug. Second, these sections had to be locked into position 85 feet underwater. Finally, the last touches, such as tiling the inside, were completed.

It is the only underwater vehicle tunnel currently in operation in the state. The tunnel consists of a single bore, 895 meters (2,909 feet) in length, with a six-percent roadway grade outward from the center towards each exit. Forced transverse ventilation is potentially provided by three automatic high-speed Westinghouse Sturtevant blower fans located in a tower at the north entrance. These fans are designed to keep the air free from high-levels of carbon monoxide.

In the event of electrical failure, a generator can support the electrical needs of the tunnel. Every twelfth light is powered by a generator. The light intensity at the portals is three times brighter than the interior. This prevents temporary blindness when entering the tunnel.

Flooding is practically impossible. Pumps located under the road surface drain the water back into the ship channel. Before Hurricane Ike in 2008, the tunnel had never been flooded.

The tunnel is one of five vehicular crossings of the Ship Channel. The other four are the Sidney Sherman Bridge, popularly known as the 610 or Ship Channel bridge; the Sam Houston Tollway Ship Channel Bridge, formerly the Jesse Jones Toll Bridge and popularly known as the Beltway 8 Bridge; the Fred Hartman Bridge in Baytown, Texasmarker; and the Lynchburg Ferry. The tunnel is also the only 24 hrs. operation in Precinct Two.

The tunnel was added to the National Register of Historic Places on April 16, 2008.

Specifications

Total Cost: $7,683,915 (1950)

Total Length: 3,791 Ft.

Distance between Portals: 2,936 Ft.

Length of Tube Section: 1,500 Ft.

Roadway Width: 22 Ft.

Headroom (each lane): 13 Ft.

Headroom (center Lane): 18 Ft.

Internal Diameter of Tubes: 32 Ft.

External Diameter of Tubes: 38 Ft.

Max. Grade: 6%

Max. Dept (Water to top): 45 Ft.

Max. Dept (Water to roadway): 68 Ft.

Max. Dept (water to bottom): 80 Ft.

Dredging: 425,273 cu. yards

Excavation: 289,600 cu. yards

Tremie Concrete: 11,750 cu. yards

Concrete: 34,250 cu. yards

Steel in tubes: 2,373 tons

Ceramic Tile: 1,061,000

Number of fans: 3

Max Ventilation: 760,000 cfm

Complete Air Exchange: 2 minutes

References

  1. Harris County Commissioner Precinct Two
  2. Houston Community Newspapers Online - Commissioner evaluates traffic in Washburn Tunnel
  3. NRHP


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