Lopez Lake is a reservoir near the city of Arroyo Grande in San Luis Obispo County, California.

The lake is formed by Lopez Dam on Arroyo Grande Creek, 9 mi (14 km) upstream from the Pacific Ocean.

The dam was built in 1969 (56 years ago) (1969) and is operated by the San Luis Obispo County Flood Control and Water Conservation District.

[4] A network of equestrian, bike and hiking trails criss-cross the park which is primarily oak woodland and coastal sage scrub.

The area is frequented by black bears, mountain lions, mule deer and a number of other small mammals.