Arroyo Conejo

Arroyo Conejo (Spanish for “Rabbit Creek”) is the longest creek in the Conejo Valley, sprawling over the cities of Newbury Park, Thousand Oaks, Camarillo, and the CDP’s Casa Conejo and Santa Rosa Valley. Arroyo Conejo is the primary drainage for the City of Thousand Oaks Its total area is 57 square miles; 43 sq. miles in the Conejo Valley and 14 additional sq. miles in the Santa Rosa Valley.

It runs from the Conejo Hills of Newbury Park, crosses horizontally Casa Conejo, before entering Thousand Oaks and Wildwood Regional Park. It originates in the Conejo Hills and streams into Hill Canyon and further into the Santa Rosa Valley, where it merges with Arroyo Santa Rosa and becomes Conejo Creek. Conejo Creek drains through the Pleasant Valley Basin and enters into the Pacific Ocean by its estuary at Mugu Lagoon at the north end of the Santa Monica Mountains. Its northern border is made up by the Santa Susana Mountains, South Mountain and the Oak Ridge Mountains. Its southern boundary is compromised by the Santa Monica Mountains to the southwest and the Simi Hills to the southeast.

The area surrounding Arroyo Conejo was once inhabited by the Chumash Indians, who also settled much of the region from the Santa Monica Mountains to the Conejo- and Simi Valleys, with their presence dating back 10,000-12,000 years. There have numerous discoveries of Chumash artifacts and petroglyphs along the creek, particularly in the Santa Monica Mountains.

Some of the fauna found in the creek includes the Western pond turtle and numerous species of amphibians: the California red-legged frog, Western toad, American bullfrog, California toad and the Pacific tree frog. Fish species include the Brown bullhead, Green sunfish, Bluntnose minnow, and Mosquitofish. It is an important habitat for various species of freshwater-nesting birds in the Conejo 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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