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Yerba Buena Island Tunnel


Yerba Buena Island Tunnel

Approaching tunnel from East side, traveling West after crossing Eastern portion of bridge.

Photo taken by Craig Philpott


BH Photo #179348


Street Views 


The replacement of the eastern span of the Bay Bridge will result in a complex change in the connection of the tunnel to the eastern span. The present eastern span and the tunnel are double decked. The new eastern span is one level. The entire construction project has taken place while the existing bridge has served traffic, being closed only a couple of times for two days over major holidays, a remarkable accomplishment.


Tunnel under Yerba Buena Island on I-80 in San Francisco
San Francisco, San Francisco County, California
Open to traffic
Built 1936
Reported to be the largest single bore tunnel in the world, the double decker road through the tunnel connects the double decker eastern and western spans of the San Francisco-Oakland Bay Bridge. The upper roadbed is suspended between the walls of the tunnel. When commuter trains were taken off the bridge in the late 1950s and traffic patterns on the bridge modified from bi-directional on both decks of the bridge to one way on each deck. To accomodate trucks in the outer lanes of the upper deck, the upper roadbed in the tunnel was lower slightly, but noticeably.
Length of largest span: 540.1 ft.
Total length: 1,791.1 ft.
Approximate latitude, longitude
+37.80833, -122.36667   (decimal degrees)
37°48'30" N, 122°22'00" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/555749/4184738 (zone/easting/northing)
Quadrangle map:
Oakland West
Average daily traffic (as of 1998)
Inventory numbers
CA 34-4 (California bridge number)
BH 11426 (Bridgehunter.com ID)
Inspection report (as of August 2013)
Overall condition: Good
Superstructure condition rating: Good (7 out of 9)
Substructure condition rating: Good (7 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 63.9 (out of 100)
View more at BridgeReports.com

Update Log 

  • October 2, 2014: New photos from Royce and Bobette Haley
  • August 7, 2011: Updated by Mike Buckley: Added more detail to description and a current picture of the tunnel.
  • September 25, 2010: New photos from Craig Philpott
  • May 23, 2010: New Street View added by Craig Philpott