Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.117.193 San Leandro Bay

The drawspans of the California Department of Transportation highway and bicycle drawbridges, mile 0.0 and mile 0.1, between Alameda and Bay Farm Island, must open on signal;  except that, from 5 a.m. to 8 a.m. and 5 p.m. to 9 p.m., the drawspans must open on signal if at least 12 hours notice is given. Notice must be given to the drawtender of the Bay Farm Island drawbridges from 8 a.m. to 5 p.m. and to the drawtender of the Park Street Drawbridge at Alameda at all other times. The drawspans need not be opened for the passage of vessels from 9 p.m. to 5 a.m.