The place to camp if you're visiting Marble. Crystal River is a little gem. Beware the vermin.
on a lovely little aspen-lined creek a few miles above Bishop. You can go even farther up either road and come to a lake, but this is a nice compromise, in the valley below the fork in the road. Save a few miles of driving straight up. Behind a big-ass moraine which cuts the valley in two. It's open and very pretty, with the annoying corporate management that most (all?) of the Inyo Forest campgrounds have.
1.6 miles of unpleasant washboardy gravel road. The same turnoff as Collier State Park - cheaper, and you get what you pay for! Flat, featureless, 3' tall undergrowth and 60' tall ponderosa pines scattered about. There is a trail to the Williamson River about 1/3 mile away.
Nestled between too-busy US 395 and the West Walker River. Everybody is either a fishermen or folks bombing down 395. The first nice federal campground coming south from Reno. This place should be open more days of the year - closes too early in the fall, opens too late in the summer.