flows W to North Fork Fortymile River, 32 mi. SW of Eagle, Yukon- Tanana High. 23 miles long.
Prospectors' name obtained in 1898 by E. C. Barnard, U.S. Geological Survey (USGS).
Middle Fork Fortymile River, Middle Fork North Fork Fortymile River,
Streams:Anaconda Creek, Bear Creek, Bonton Creek, Buck Creek, Bullion Creek, Butte Creek, Cassiar Creek, Champion Creek, Comet Creek, Crazy Wolf Creek, Gold Creek, Hutchinson Creek, Little Bonanza Creek, McMahon Creek, Meyers Creek, Sleem Creek,