The Arroyo Simi (

Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many countries in the Americas **Spanish cuisine **Spanish history **Spanish culture ...

for "Small Stream of Simi", sometimes also referred to as Simi Creek) is a westwards-running creek, located in

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

, United States, running from the city of

Simi Valley Simi Valley (; Chumash: ''Shimiyi'') is a city in the valley of the same name in southeastern Ventura County, California, United States. It is from Downtown Los Angeles, making it part of the Greater Los Angeles Area. Simi Valley borders Th ...

and crosses the valley from east to west, before entering the city of Moorpark.Appleton, Bill (2009).
Santa Susana
'. Arcadia Publishing. Page 27. . It originates at Corriganville Park by the

Santa Susana Pass The Santa Susana Pass, originally Simi Pass, is a low mountain pass in the Simi Hills of Southern California, connecting the San Fernando Valley and Los Angeles neighborhood of Chatsworth, to the city of Simi Valley and eponymous valley. It h ...

, travels for through Simi Valley, leaves the city limits of Oak Park at the western end of Simi Valley, continues for seven miles in Moorpark where it merges with Arroyo Las Posas by Hitch Road. It is a tributary to the

Calleguas Creek Calleguas Creek (; Chumashan languages, Chumash: ''Kayïwïsh'', meaning "the head") is the terminus of a river system in Ventura County, California. It drains the Calleguas Creek Watershed, an area 30 miles long and 14 miles wide (343 square mile ...

, which enters the Pacific Ocean by its estuary at

Mugu Lagoon Mugu Lagoon (; Chumash: ''Muwu'', meaning "Beach") is a salt marsh located within the Naval Base Ventura County at the foot of the Santa Monica Mountains in Ventura County, California. The lagoon extends for 4.3 miles parallel to a narrow barrier ...

Naval Air Station Point Mugu Naval Air Station Point Mugu was a United States naval air station near Oxnard, California, which operated as an independent base from 1941 to 2000, when it merged with nearby Naval Construction Battalion Center Port Hueneme to form Naval Base ...

. Arroyo Simi drains an area of 343 square miles in southern

Ventura County Ventura County () is a county located 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 ...

. In its natural state, it is an

ephemeral Ephemerality (from the Greek word , meaning 'lasting only one day') is the concept of things being transitory, existing only briefly. Academically, the term ephemeral constitutionally describes a diverse assortment of things and experiences, fr ...

creek, which is only seasonally filled during winter time and periods of heavy rain. Today it is for the most part a concrete lined water drain that flows year round. Tributaries to the Arroyo Simi include the Alamos, Sycamore, Dry, Tapo, Las Llajas, White Oak, Runkle, and Bus Canyon Creeks, as well as the Erringer Road and North Simi Drains. Arroyo Simi Greenway is an ongoing construction project by the City of Simi Valley to increase the recreational use of its river parkways. The project includes new paved hiking and biking trails along the Arroyo Simi, exhibit signs, sixteen new trail entries, and more. The area is administered as the Arroyo Simi Bike Path by the Rancho Simi Recreation and Park District (RSRPD). It is home to native flora, fish, and birds. It is home to fish species such as the brown bullhead, green sunfish, bluntnose minnow, and mosquitofish. It is an important habitat for various species of freshwater-nesting birds in the Simi Valley. Some of the species include the great blue heron, white-faced ibis, black-crowned night heron, green heron, black-necked stilt, great egret, snowy egret, belted kingfisher, black phoebe, killdeer, common yellowthroat, greater yellowlegs, American coot, and mallard.(Pages 30–33).

References

{{Coord, 34.271619, -118.9246, display=title Rivers of Ventura County, California Geography of Simi Valley, California Moorpark, California Santa Susana Mountains Simi Hills Washes of California Rivers of Southern California