Threemile Reservoir   Be the first to submit input for Threemile Reservoir. If you have info on Threemile Reservoir, Warner Mountains, Lassen County, California please submit it here to improve this web site.          These outdoors activities are available near Threemile Reservoir.   Hotels Near Threemile Reservoir: Best Western Trailside Inn, Alturas, 29 miles away Super 8 Alturas, Alturas, 29 miles away Diamond Mountain Casino Hotel, Susanville, 30 miles away Super 8 Susanville, Susanville, 31 miles away Budget Host Frontier Inn, Susanville, 31 miles away   Ski Areas Near Threemile Reservoir: Warner Canyon, Oregon, 68 miles away       730 foot drop, 1 lifts, 14 runs Tahoe Donner, California, 85 miles away       600 foot drop, 4 lifts, 14 runs Boreal, California, 85 miles away       500 foot drop, 10 lifts, 41 runs