It is one of the Project's largest recreational lakes and the terminal of its west branch. The site includes 29 miles of shoreline. A major attraction is the 425-foot tall Castaic Dam. Castaic Lake has two bodies of water. Lower lake is for non-power boating and canoeing.
Upper lake is for sailing, power boating, water and jet skiing, and fishing.
The lake is stocked with bass, trout and catfish. Boat rentals and a tackle bait shop are available. Other recreational activities include hiking, biking trails, picnic areas and playgrounds. Rental group picnic areas are available for up to 600 persons. From Ventura, it is 51 miles to Castaic Lake via Highway 126 and Interstate 5.