Route 260 (California)
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| Length: | 6.970 mi (11.217 km) Length of SR 112 is 1.782 mi (3 km) and length of SR 260 is 1.924 mi (3 km) |
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| Existed: | 1964 – present | |||||||||
| Restrictions: | No hazardous materials in the Posey and Webster Street tubes | |||||||||
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| South end: |
 SR 185 in San Leandro
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| North end: |
 I-880 in Oakland
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State Route 61 (SR 61) is a California, United States, highway which runs along the 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 the intersection of Webster Street and Atlantic Avenue. SR 260 then picks up from there, running northeast along Webster Street and through the Posey and Webster Street tubes to near Interstate 880 in Oakland.
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.
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