The Aliso Creek Watershed covers 34.87 square miles and includes portions of the cities of Aliso Viejo, Dana Point, Laguna Hills, Laguna Niguel, Laguna Woods, Lake Forest and Mission Viejo. Its main tributary, Aliso Creek, originates in the Santa Ana Mountains inside the boundaries of Cleveland National Forest. Smaller tributaries include Wood Canyon, Sulphur Creek, the Aliso Hills Channel, and English Channel.
In July 1999 the U.S. Army Corps of Engineers (ACOE) completed the Aliso Creek Watershed Management Feasibility Study. This study was sponsored by the ACOE, County of Orange, and municipalities and water districts within the Aliso Creek watershed. The Feasibility Study identified a number of water resource issues including erosion and damage to habitat and utilities. In 2002, the ACOE completed the Aliso Creek Watershed Management Study which examined management measures that could address the watershed problems identified by the feasibility study. The Aliso Creek Ecosystem Restoration Project was one of the recommended projects resulting from the management study. A Federal Cost Sharing Agreement has been executed between the ACOE and the County of Orange to conduct a study, the Aliso Creek Mainstem Ecosystem Restoration Feasibility Study. The study is current underway with completion slated for the fall of 2015. For more information on this study please click here.
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