flows SW to North Fork Fortymile River, 32 mi. SW of Eagle, Yukon-Tanana High. 20 miles long.
Named by prospectors; reported in 1903 by T. G. Gerdine (in Prindle, 1905, pl. 16), 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,