Once on CR20, drive 9.1 miles west to Capitol City on a graded, gravel road passable to passenger vehicles. On the Gunnison National Forest map, this road is labelled as BLM3303. At 5.2 miles into this drive, you'll pass the Nellie Creek Road (FR877) which accesses Uncompahgre Peak and several 13ers located in that area. At Capitol City take the right fork and continue NW on FR870 (aka: CR24) to the Matterhorn Creek trailhead turnoff at 11.1 miles from Lake City. The road becomes rougher but higher clearance SUV's and cross-overs should be able to handle. Coordinates for the turnoff are: N 38° 01' 22.65" W 107° 29' 31.09". Many vehicles will choose to park here. If you have better clearance, drive north on rougher road (FR870.2A) for just over .6 mile to the trailhead parking area. See coordinates below. There's a small parking area with a gate. Best to have at least stock 4WD for this last section.
There are no forest service campgrounds along CR20. All camping is in primitive sites which can be found along CR20 and the best location is in the vicinity of Capitol City, but be careful about private property in that area and be aware of weekend, large group incursions if you're looking for peace and quiet. There are also a few other primitive sites at the turnoff for the trailhead both before and beyond.