Great Northern Reservoir   Be the first to submit input for Great Northern Reservoir. If you have info on Great Northern Reservoir, Liberty County, Montana please submit it here to improve this web site.          These outdoors activities are available near Great Northern Reservoir.   Marinas On or Near Great Northern Reservoir: Tiber Marina Campground, Liberty County, 14 miles away   Ski Areas Near Great Northern Reservoir: Showdown, Montana, 79 miles away       1400 foot drop, 4 lifts, 34 runs Bear Paw Ski Bowl, Montana, 91 miles away       900 foot drop, 2 lifts, 25 runs