Eleven Horse Reservoir   Be the first to submit input for Eleven Horse Reservoir. If you have info on Eleven Horse Reservoir, Steens Mountains, Harney County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Eleven Horse Reservoir.   Hiking Trails Near Eleven Horse Reservoir: The Beef Trail, Harney County, 4 miles away       5 hiking miles, 644 feet elevation difference