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Calleguas Creek (; Chumash: ''Kayïwïsh'', meaning "the head") is the terminus of a river system in
Ventura County, California Ventura County () is a county in the southern part of the U.S. state of California. As of the 2020 census, the population was 843,843. The largest city is Oxnard, and the county seat is the city of Ventura. Ventura County comprises the Oxn ...
. It drains the Calleguas Creek Watershed, an area 30 miles long and 14 miles wide (343 square miles), which includes
Simi Valley Simi Valley (; Chumash: ''Shimiyi'') is a city in the valley of the same name in the southeast region of Ventura County, California, United States. Simi Valley is from Downtown Los Angeles, making it part of the Greater Los Angeles Area. T ...
, Moorpark, Camarillo and a large portion of Thousand Oaks. Tributaries include Arroyo Simi, Arroyo Santa Rosa, Revolon Slough and Arroyo Conejo. It discharges into the Pacific Ocean, the Santa Barbara Channel, at Mugu Lagoon on Naval Base Ventura County, just north of Point Mugu, where the
Santa Monica Mountains The Santa Monica Mountains is a coastal mountain range in Southern California, next to the Pacific Ocean. It is part of the Transverse Ranges. Because of its proximity to densely populated regions, it is one of the most visited natural areas in ...
meet the ocean, marking the southern/eastern boundary of the Oxnard Plain. In 2009, Calleguas Creek was named the most polluted body of water in the jurisdiction of the
Los Angeles Regional Water Quality Control Board The California State Water Resources Control Board (SWRCB) is one of six branches of the California Environmental Protection Agency. History This regulatory program has had the status of an official government department since the 1950s. The St ...
. Pollution along the river system has been an issue for decades.


References

Rivers of Ventura County, California Camarillo, California Geography of Thousand Oaks, California Geography of Simi Valley, California Newbury Park, California Geography of Oxnard, California Moorpark, California Washes of California Santa Susana Mountains Simi Hills Canyons and gorges of California {{VenturaCountyCA-geo-stub