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This is to discuss US cities that have tunnels. I'm not referring to highway underpasses which almost every city has, but actual long tunnels and how they affect the city in general and traffic.
I only know of a few major cities with tunnels, but there have to be smaller cities that have them as well. Here are the major ones I know of. Strangely only SF is the only one outside of the northeast.
New York
Boston
Baltimore
Pittsburgh
San Francisco
DC has some smaller ones but I don't think they really are major features/obstacles in the city.
Seattle:
--I-90 has a combination deep bore and cut-cover tunnel for 2/3 of a mile. In the suburbs it has a lid that might be 1/3 of a mile.
--I-5 is lidded by a small park and a convention center Downtown.
--SR-99 has a six-block tunnel. In a few months a 1.8-mile deep bore tunnel through Downtown will replace that and a waterfront viaduct.
If you're counting rail, there are a handful of light rail tunnels plus a century-old heavy-rail tunnel through Downtown.
Seattle:
--I-90 has a combination deep bore and cut-cover tunnel for 2/3 of a mile. In the suburbs it has a lid that might be 1/3 of a mile.
--I-5 is lidded by a small park and a convention center Downtown.
--SR-99 has a six-block tunnel. In a few months a 1.8-mile deep bore tunnel through Downtown will replace that and a waterfront viaduct.
If you're counting rail, there are a handful of light rail tunnels plus a century-old heavy-rail tunnel through Downtown.
Oh interesting, thanks. I wasn't counting rail, but I think all of the major cities I mentioned also have passenger rail tunnels (Baltimore I'm not sure about)
Los Angeles has a series of small tunnels. Northbound -110 from Chinatown to the LA River.
Downtown LA has 2 small tunnels under Bunker Hill - 2nd Street Tunnel and 3rd Street Tunnel.
Another small tunnel on Sepulveda Blvd north of Skirball Center
Small tunnel to get to the Griffith Observatory.
The N110 was originally the Figueroa St Tunnels and offered an alternative to connect downtown to the NE communities othre than Broadway Ave. When the Arroyo Seco Parkway (mentioned in Who Framed Roger Rabbit movie) was built to connect Pasadena to Downtown LA the Tunnel was was converted one way to be northbound and a southbound lanes at a higher elevation was constructed so no tunnels.
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