Hayes Creek is a small

river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...

San Francisco, California San Francisco, officially the City and County of San Francisco, is a commercial, Financial District, San Francisco, financial, and Culture of San Francisco, cultural center of Northern California. With a population of 827,526 residents as of ...

, that has been largely

culvert A culvert is a structure that channels water past an obstacle or to a subterranean waterway. Typically embedded so as to be surrounded by soil, a culvert may be made from a pipe (fluid conveyance), pipe, reinforced concrete or other materia ...

ed. The only remaining portion above ground is in the Mission Creek Channel that drains into China Basin.Museum of California
Watershed map, access date December 31, 2008

Notes

Rivers of San Francisco Subterranean rivers of the United States Rivers of Northern California Tributaries of San Francisco Bay {{California-river-stub