San Diego Creek
General data
- Name: San Diego Creek
- Water system: Upper Newport Bay
- Water type: River
- Progression: Upper Newport Bay -> Newport Bay (California) -> Pacific Ocean -> Planet Earth
- Climates: Subtropical
- Continents: North America
- Countries: United States of America
San Diego Creek is a 16-mile (26 km) urban waterway flowing into Upper Newport Bay in Orange County, California, United States. Its watershed covers 112.2 square miles (291 km2) in parts of eight cities, including Irvine, Tustin, and Costa Mesa. From its headwaters in Laguna Woods the creek flows northwest to its confluence with Peters Canyon Wash, where it turns abruptly southwest towards the bay. Most of the creek has been converted to a concrete flood control channel, but it also provides important aquatic and riparian habitat along its course and its tidal estuary.