Cone Reservoir   Be the first to submit input for Cone Reservoir. If you have info on Cone Reservoir, Steens Mountains, Harney County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Cone Reservoir.   Hiking Trails Near Cone Reservoir: The Beef Trail, Harney County, 5 miles away       5 hiking miles, 644 feet elevation difference