Big Lake Reservoir   Be the first to submit input for Big Lake Reservoir. If you have info on Big Lake Reservoir, Malheur County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Big Lake Reservoir.   Whitewater Near Big Lake Reservoir: Owyhee River, MalheurCounty, 19 miles away       Class III-IV - 65 miles long (Rome to Owyhee Reservoir)