Look at the map; the road is the first and only left as you drive up the road right at the beginning of the pay to park area at the dam, for years it was closed because of a land slide, but it's a fire road so they had to rebuild it. At the time I drove my car a 79 Monte Carlo, the road was dirt with a few ruts but if you drove slow it was safe. It takes you to the quiet/quarry cove area, if it's open be careful and drive slow because I've seen trucks and jeeps with broken axels there. I would also take an equalizer if you get my drift, because some nights I've seen people come from the brush armed with long guns. The hike to the water was not as long as from the highway, and you could see headlights of cars approaching down the road to give you time to hike up if you feared for your car being broken into.
http://www.californiasgreatestlakes....amping_map.png