Eightmile Reservoir   Be the first to submit input for Eightmile Reservoir. If you have info on Eightmile Reservoir, Steens Mountains, Harney County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Eightmile Reservoir.   Hiking Trails Near Eightmile Reservoir: The Beef Trail, Harney County, 6 miles away       5 hiking miles, 644 feet elevation difference