Aliso Creek is the main water body in the Aliso Creek Watershed; it is a long, narrow coastal canyon with headwaters in the Cleveland National Forest. The Aliso Creek watershed is approximately 35 square-miles with portions of the cities of Aliso Viejo, Dana Point, Laguna Beach, Laguna Hills, Laguna Niguel, Laguna Woods, Lake Forest, and Mission Viejo. The creek ultimately discharges into the Pacific Ocean at Aliso Beach. The Aliso Creek Watershed is mainly an urbanized area, with the exception of the Cleveland National Forest in the upper watershed and the Aliso Wood Canyon Regional Park in the lower watershed. The Aliso Creek Watershed is within the jurisdiction of the San Diego Regional Water Quality Control Board (the San Diego Regional Board). The San Diego Regional Board has placed Aliso Creek under the Laguna subunit of the San Juan Hydrologic Basin.
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