The Arroyo Simi (Spanish for “Small Stream of Simi”, sometimes also referred to as Simi Creek) is a 19-mile-long 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 twelve miles 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 st