Caltrans just faxed the following info re: northbound I-238, which will be closed between I-880 and I-580 beginning midnight and until 4 a.m. Tuesday.
Detours for motorists traveling westbound on I-580 will exit at Strobridge Avenue; turn left onto Castro Valley Boulevard, heading west, make a right onto Mission Boulevard and heading north, turn left onto Lewelling to access I-880. Signs will also be in place to guide motorists to the detours.
Caltrans: The closure is necessary so contractors can install bridge joint seals on the several bridges along I-238. Motorists should expect minor delays and proceed with caution through construction work zones.