Ralston Powerhouse is an access point on the Rubicon River near Oxbow Reservoir in El Dorado County, featuring a parking area that overlooks the river with a 100-foot penstock feeding the powerhouse.

Access to the river requires scrambling down a rip-rap rock face to reach a series of small plunge-pools and pocket water; the site provides good access to the lower Rubicon during normal summer flows, though high water can make upstream travel difficult or impossible.