The Calleguas Creek Watershed in Southeastern Ventura County

The Calleguas Creek Watershed covers approximately 343 square miles in southeastern Ventura County. The Watershed includes Conejo Creek, Arroyo Santa Rosa, Arroyo Simi, Arroyo Las Posas, and Calleguas Creek, as well as Revolon Slough and Mugu Lagoon.

 Calleguas Creek Watershed Map (from W atersheds Coalition of Ventura County )

Calleguas Creek Watershed Map (from Watersheds Coalition of Ventura County)

The northern boundary is formed by the Santa Susana Mountains, South Mountain, and Oak Ridge Mountains. The southern boundary is distinguished by the Simi Hills and Santa Monica Mountains.

About half the watershed is open space, 25% is agricultural and 25% is urban land use. 

The watershed ultimately drains to the Pacific Ocean through Mugu Lagoon.

Learn more about the Calleguas Creek Watershed at

Here is the Calleguas Creek in Camarillo, along side the Calleguas Creek Bike Path, after some significant rains in January 2017.