San Andreas Creek
| San Andreas Creek San Andrés Creek, | |
|---|---|
San Andreas Creek's San Andreas Reservoir | |
| Etymology | Saint Andrew |
| Location | |
| Country | United States |
| State | California |
| Region | San Francisco Peninsula |
| County | San Mateo County |
| Physical characteristics | |
| Source | East slope of Sweeney Ridge |
| • coordinates | 37°37′01″N 122°27′29″W / 37.61694°N 122.45806°W |
| • elevation | 918 ft (280 m) |
| Mouth | Confluence with Lower Crystal Springs Reservoir (originally with San Mateo Creek) |
• location | Pacifica, California |
• coordinates | 37°36′50″N 122°26′28″W / 37.61389°N 122.44111°W |
• elevation | 285 ft (87 m) |
San Andrés Creek (Spanish for: St. Andrew's Creek), now called San Andreas Creek, is a perennial stream that flows 5.9 miles (9.5 km) southeasterly along the San Andreas Fault from Sweeney Ridge in San Mateo County, California, providing the inflow to and outflow from San Andreas Reservoir, and then entering Lower Crystal Springs Reservoir, where it was a historic tributary to San Mateo Creek. San Mateo Creek then carries its waters over Crystal Springs Dam northeast to San Francisco Bay.