Riddle Reservoir   Be the first to submit input for Riddle Reservoir. If you have info on Riddle Reservoir, Harney County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Riddle Reservoir.   Camp Grounds Near Riddle Reservoir: Blitzen Crossing Campground, Harney County, 2 miles away Fish Lake Campground, Harney County, 9 miles away Jackman Park Campground, Harney County, 10 miles away   Hotels Near Riddle Reservoir: Best Western Rory & Ryan Inns, Hines, 50 miles away   Hiking Trails Near Riddle Reservoir: The Beef Trail, Harney County, 17 miles away       5 hiking miles, 644 feet elevation difference