Corta Reservoir   Be the first to submit input for Corta Reservoir. If you have info on Corta Reservoir, Malheur County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Corta Reservoir.   Whitewater Near Corta Reservoir: Owyhee River - North Fork, OwyheeCounty, 7 miles away       Class III-IV - 18 miles long (Off Mud Flat Road to Three Forks) Owyhee River, -blank-County, 12 miles away       Class III+(V+) - 65 miles long (Garat Crossing to Three Forks) Owyhee River, MalheurCounty, 12 miles away       Class III-IV(V) - 37 miles long (Three Forks to Rome)