Kosier Reservoir   Be the first to submit input for Kosier Reservoir. If you have info on Kosier Reservoir, Fergus County, Montana please submit it here to improve this web site.          These outdoors activities are available near Kosier Reservoir.   Ski Areas Near Kosier Reservoir: Bear Paw Ski Bowl, Montana, 80 miles away       900 foot drop, 2 lifts, 25 runs