Contra Costa Air Quality

On Tuesday, September 10, 2013, the westbound Fish Ranch Road on-ramp in Orinda, Bore Three and the westbound Caldecott Lane off-ramp in Oakland will be closed, beginning at 10:00 p.m. and reopening at 4:00 a.m. on Wednesday, September 11, 2013.

In addition to the excavation of a 3,400-foot-long tunnel north of the existing three bores, the $405 million Caldecott Fourth Bore Project includes traffic improvements on the eastern and western sides of the tunnel. The tunnel is on schedule to open to traffic in late 2013.