California State Route 61

State Route 61
SR 61 highlighted in red
Route information
Maintained by Caltrans
Length	6.970 mi[1] (11.217 km) Length of SR 112 is 1.782 mi (3 km) and length of SR 260 is 1.924 mi (3 km)
Existed	1964[2]–present
Restrictions	No hazardous materials in the Posey and Webster Street tubes[3]
Major junctions
South end	SR 185 in San Leandro
Major intersections	I-880 in San Leandro
North end	I-880 in Oakland
Location
Country	United States
State	California
Counties	Alameda
Highway system
State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways
← SR 60 → SR 62
← SR 111 → SR 113 ← SR 259 → SR 261

State Route 61 (SR 61) is a state highway in the U.S. state of California, running along the eastern edge of Oakland International Airport and through Alameda. Two additional "hidden" state highways, State Route 112 (SR 112) and State Route 260 (SR 260), are also signed as part of SR 61, despite having legal descriptions separate from Route 61.

SR 112 runs along Davis Street from State Route 185 (East 14th Street) west to Doolittle Drive in San Leandro. SR 61 proper then follows Doolittle Drive north near the eastern boundary of Oakland International Airport to Bay Farm Island and across the Bay Farm Island Bridge to Alameda Island. SR 61 then runs on various city streets in Alameda to Webster Street. SR 260 then goes from Webster Street through the Posey and Webster Street tubes to near Interstate 880 in Oakland. As early as 2012, a sign indicating SR 61 East near the I-880 interchange was replaced with an SR 112 shield; as of 2021, that sign remains as the only signage for SR 112.^{[4][unreliable source?]}

As legislatively defined, Route 61 extends as far north as Albany and as far south as the Dumbarton Bridge's east approach. Only the portion between Routes 260 and 112 is constructed; the unbuilt remainder of the route exists today either as open San Francisco Bay or wetlands. This route would likely have sat atop landfill; as public opinion shifted against filling in the bay, completing the remaining portions of Route 61 also fell out of favor. Route 87 is another highway once proposed to traverse present-day wetlands and open water.