Big Boulder Reservoir   Be the first to submit input for Big Boulder Reservoir. If you have info on Big Boulder Reservoir, Harney County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Big Boulder Reservoir.   Lakes Near Big Boulder Reservoir: Warm Springs Reservoir, Malheur County, 9 miles away   Public Lands Near Big Boulder Reservoir: Malheur National Forest, Oregon, 36 miles away