Mosquito Flat Campground offers 11 first-come, first-served sites at 7,180 feet elevation in the Salmon-Challis National Forest, 15 miles northwest of Challis, with direct access to a 49-acre reservoir featuring a Forest Service boat ramp for fishing and boating.

Each site includes a picnic table and fire ring, with vault toilets available, but campers must bring their own water and pack out all trash.

Note that access requires navigating narrow, challenging dirt roads with creek crossings and switchbacks that can be difficult for RVs longer than 24 feet, and the campground is only open June 1–October 15.