Thermalito Afterbay Access at Monument Hill offers a two-lane boat ramp with floating dock on the eastern shoreline, along with 10 picnic tables, 9 BBQs, a fish cleaning station, and a swimming beach.

Parking includes 10 single-vehicle spaces and 39 vehicle/trailer combination spaces (with ADA accessibility), plus an additional graded gravel area accommodating 30-40 vehicles with trailers.

The afterbay's 17 miles of shoreline and 4,300 surface acres support boating, paddling, swimming, and fishing with no-wake speed limits before and after sunset for peaceful recreation.