33 CFR §117.193

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.