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Arroyo Simi
Arroyo-Simi-Biking-Trail-seen-from-Frontier-Park-Simi-Valley.jpg
Arroyo Simi seen from Frontier Park.
Country United States
Physical characteristics
Main source Corriganville Park, Simi Valley
River mouth Merges with Arroyo Las Posas in Moorpark, discharges to the Pacific by Mugu Lagoon
Length 19 mi (31 km)
Basin features
River system Calleguas Creek
Tributaries
  • Left:
    Runkle Canyon- and Bus Canyon Creeks, and Erringer Drain
  • Right:
    Aaamos Canyon-, Dry Canyon-, Tapo Canyon-, Las Llajas Canyon-, and White Oak Creeks, and North Simi Drain

The Arroyo Simi (Spanish for "Small Stream of Simi", sometimes also referred to as Simi Creek) is a 19-mile (31 km) westwards-running creek, running from the city of Simi Valley and crosses the valley from east to west, before entering the city of Moorpark. It originates at Corriganville Park by the Santa Susana Pass, and streams westwards into Moorpark where it merges with Arroyo Las Posas by Hitch Road. It extends for 12 miles (19 km) through the Simi Valley, and leaves the city limits by Oak Park at the western end Simi Valley, and continues for seven miles in Moorpark. It is a tributary to the Calleguas Creek, which enters the Pacific Ocean by its estuary at Mugu Lagoon by Naval Air Station Point Mugu. Besides an arroyo, it has been described as a channel, waterway, river, drain, wash, and stream. Arroyo Simi drains an area of 343 square miles in southern Ventura County. In its natural state, it is an ephemeral 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 includes Aaamos Canyon-, Sycamore-, Dry Canyon-, Tapo Canyon-, Las Llajas Canyon-, White Oak-, Runkle Canyon-, 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 in order 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 administrated as the Arroyo Simi Bike Path by the Rancho Simi Recreation and Park District (RSRPD). It is home to native flora, fish, and avifauna. 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.

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