This lake is located in Section 36, T39N, R6W. Access it via the South Fork Road (Road 26) from the W.A. Barr Road. About 13.5 miles up Road 26, take the unmarked spur road to the left. This is at the first creek crossing down from the Gumboot-Mumbo summit. This 0.25 mile road, which accesses Mumbo Lake and parallels its outlet, should not be attempted in a low-clearance vehicle. Upper Mumbo Lake is cross-country 0.2 miles upstream and east from Mumbo Lake.
The fishing can be very good, but can be hard to fish from shore due to the swampy shoreline. There is a huge spring in the middle of the lake. This lake is on National Forest land.
Species present: Brook Trout
Seasons: Open all year.
Bag limit: 5 per Day, 10 in possession.
Date of usual ice out: June 1 (6,100' elevation)
Camping: Several good sites, infrequently used, are available. Reports indicate that biting insects can be a problem. Firewood is available.
Surface acres: 3 acres and 15' deep.