The lake was created in 1938 following the construction of a dam across Houston Creek.
The park is situated within the San Bernardino National Forest, surrounded by ponderosa and Jeffrey pine trees.
The lake's water level is artificially maintained as part of the regional water management system.
Lake Gregory was named after Arthur Gregory, who helped secure the funding and support for the initial dam project.
The surrounding elevation causes a significant temperature drop compared to the valleys located just a few thousand feet below.
Lake Gregory Regional Park is a 150-acre alpine lake basin located in the San Bernardino Mountains at an elevation of 4,500 feet. The park serves as a hub for year-round mountain recreation, centered around a 84-acre lake managed by the San Moritz Lodge and Lake Gregory Recreation Company. Visitors utilize a three-mile walking trail that encircles the perimeter of the lake. The facility features a seasonal water park with two massive slides and a splash pad during warmer months. Fishing is a primary activity, with the lake regularly stocked with trout by the California Department of Fish and Wildlife. The surrounding topography consists of forested terrain, providing a cooler climate compared to the nearby Inland Empire basin. Picnic areas are available throughout the grounds, equipped with tables and barbecue stations for public use. Swimming is restricted to designated beach areas during the operational summer season. The lake acts as a reservoir and remains a central focal point for the Crestline community.
The wooden footbridge on the north side of the lake, offering a panoramic view of the water and the surrounding pine forest.
Bring layers, as mountain temperatures can fluctuate rapidly once the sun goes behind the surrounding peaks.
Wear comfortable, closed-toe walking shoes if you plan to complete the full three-mile perimeter trail.
Check local fire restrictions before planning a visit, as the park’s barbecue policy changes based on high-fire-danger conditions.
Attempting to swim in non-designated areas, as the lake is deep and water temperatures can be cold even in summer.
Water park facilities and swimming areas typically operate only during the summer season; hiking trails remain accessible year-round.
Proper swimming attire is required for the water park; pets must remain leashed at all times and are restricted from designated beach zones.
