San Luis Reservoir is a large reservoir located in the western San Joaquin Valley of California near Pacheco Pass. The reservoir consists of three interconnected bodies of water: San Luis Reservoir, O'Neill Forebay, and Los Banos Creek Reservoir. Paddlers can access San Luis Reservoir from Highway 152 via entrances on Basalt Road and Dinosaur Point Road, with boat launches available at Dinosaur Point and Basalt (though Basalt is temporarily closed). O'Neill Forebay can be accessed from Donohugh Road and Gonzaga Road, with boat launches at both entrances.

The most significant hazard for paddlers is the strong winds that frequently occur on all three lakes. Wind warning lights are positioned at key locations around San Luis Reservoir and O'Neill Forebay to alert boaters of dangerous conditions. Paddlers should exercise extreme caution and be prepared for sudden changes in wind and weather.

Boating hours on all three lakes are from sunrise to sunset, with no boats allowed on the water overnight. Speed limits vary throughout San Luis Reservoir and O'Neill Forebay, while Los Banos Creek Reservoir has a 5 mph speed limit across the entire lake.

The area is known for excellent fishing, with striped bass, largemouth bass, crappie, and other species available. Guided kayak tours led by California State Parks staff are offered in the summer, starting at 8:30 am.

Several hiking trails are available near the water, including the 5-mile San Luis Creek Accessible Trail along O'Neill Forebay's shoreline. The Romero Overlook Visitors Center provides information about the reservoirs and offers panoramic views.

Paddlers should be aware of shallow areas, particularly during periods of low water levels. The lakes are part of the State Water Project and Central Valley Project, so water levels can fluctuate significantly throughout the year.