The combined SR 112/61/260 route begins at
SR 185 in
San Leandro. Running along Davis Street, it then interchanges with
Interstate 880 before it heads to Doolittle Drive. It then continues northward along Doolittle Drive and enters the city of
Oakland, running along the eastern boundary of
Oakland International Airport. The highway then enters the city of
Alameda at
Bay Farm Island before crossing the
San Leandro Bay via a drawbridge to Alameda Island. SR 61 then goes west along Otis Drive, then north along Broadway until reaching Encinal Avenue. The route then heads west on Encinal Avenue and Central Avenue to Webster Street. The highway then runs across Webster Street and through the
Posey and Webster Street tubes before terminating at I-880 and 7th Street in Oakland. The route does not directly intersect with I-880 here, so drivers are instructed to get onto I-880 south via Oak Street or I-880 north via Jackson Street. There are two tube entrances on the Oakland side, one on Webster Street, and the other at the intersection of Broadway and 5th Street; the latter can be reached from I-880's Broadway off-ramps. California's legislature has relinquished state control of the segment along Webster Street between Central Avenue and Atlantic Avenue, and thus that portion is now maintained by the City of Alameda. SR 61 is part of the
California Freeway and Expressway System, and all three routes are part of the
National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the
Federal Highway Administration. ==Major intersections==