Malibou Lake is a small reservoir surrounded by a residential development in the Santa Monica Mountains near Agoura Hills, California. Adjacent to Malibu Creek State Park and within the Santa Monica Mountains National Recreation Area, it is situated between Malibu Beach and the Conejo Valley. It was created in 1922 after the Malibu Lake Club Dam was b…Malibou Lake is a small reservoir surrounded by a residential development in the Santa Monica Mountains near Agoura Hills, California. Adjacent to Malibu Creek State Park and within the Santa Monica Mountains National Recreation Area, it is situated between Malibu Beach and the Conejo Valley. It was created in 1922 after the Malibu Lake Club Dam was built at the confluence of two creeks. The lake, and community of 250 residents are private.