Three Forks Rim Reservoir   Be the first to submit input for Three Forks Rim Reservoir. If you have info on Three Forks Rim Reservoir, Malheur County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Three Forks Rim Reservoir.   Whitewater Near Three Forks Rim Reservoir: Owyhee River, -blank-County, 1 miles away       Class III+(V+) - 65 miles long (Garat Crossing to Three Forks) Owyhee River, MalheurCounty, 1 miles away       Class III-IV(V) - 37 miles long (Three Forks to Rome) Owyhee River - North Fork, OwyheeCounty, 12 miles away       Class III-IV - 18 miles long (Off Mud Flat Road to Three Forks)