It's hard to find this campground, especially at night. The trail guide should help, as ling as you have it saved offline before you leave Bridgeport. Mobile service peters out in Buckeye Canyon.
To get there, one can follow Twin Lakes Rd. until the turnoff for Don & Al's Resort. Stay left to remain on Buckeye Rd. pavement turns to well-maintained dirt - I traversed it painlessly in a sports car. Follow the signs, and don't be confused by the boondockers. Eventually, after crossing Buckeye Creek twice on one-lane bridges, one arrives at the campground. Most of he 64 sites have parking spots, picnic tables, fire circles, a flat spot for a tent, and access to pit toilets -- but no water. Lots of shade provided by tall sugar pines.
Alternate entry from the north on 395: Before slowing down for Bridgeport, go right on Buckeye Rd. Road hugs ridge above By-Day Creek. After passing parking area for Buckeye Hot Springs (recommended!), proceed to campground.