Mount Baker Tunnel (Seattle, Washington)
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The Mount Baker Tunnel carries Interstate 90 under the Mount Baker neighborhood of Seattle, Washington. It is actually twin tunnel bores, one completed in 1940 (rehabilitated in 1993) and the other completed in 1991. The official length is 1440 feet, though driving through you will notice the length is closer to a kilometer because of a cut-and-cover "lid" between the western portal and the beginning of the actual tunnel under the Mount Baker ridge. The eastern end of the tunnel links to the I-90 floating bridge on Lake Washington.
At 63 feet (19 meters) in diameter, it is the world's largest diameter soft earth tunnel, having been bored through clay.
At 63 feet (19 meters) in diameter, it is the world's largest diameter soft earth tunnel, having been bored through clay.
Wikipedia article: http://en.wikipedia.org/wiki/Mount_Baker_Tunnel
Nearby cities:
Coordinates: 47°35'24"N 122°17'43"W
- Downtown Seattle Transit Tunnel 4.2 km
- Stampede Tunnel 79 km
- Old Cascade Tunnel 90 km
- Tunnel to Buntzen Lake 203 km
- Coquihalla Canyon Provincial Park 211 km
- Trail of the Hiawatha Bike Trail 494 km
- CMSP&P St Paul Pass Tunnel 20 499 km
- Railway Tunnel 811 km
- CNR Wolverine tunnel 820 km
- Union Pacific Altamont Tunnel 1157 km
- Sam Smith Park 0.2 km
- Colman Park 0.7 km
- Frink Park 1 km
- Leschi 1.2 km
- Mt. Baker 1.4 km
- Central District 1.7 km
- Lacey V. Murrow Memorial Bridge & Homer M. Hadley Memorial Bridge, The I-90 Floating Bridge 1.8 km
- Seafair Hydroplane Race Course 2.1 km
- Beacon Hill 4.3 km
- Lake Washington 6.1 km