End of the road
There’s a pretty nice entrance into Folsom Lake State Recreation Area at the eastern end of Horseshoe Bar Road (Placer County) — but only if you’re on foot. There’s no parking allowed along the road’s shoulder and no lot for cars. That’s why I had never actually seen this area until the day I hiked the two or so miles north from the parking area at Sterling Pointe Equestrian Staging Area. The other option would be to hike south from Rattlesnake Bar; if I can get around to trying that one of these days I’ll report back on the trail conditions and how far it is.