Arritola Reservoir   Be the first to submit input for Arritola Reservoir. If you have info on Arritola Reservoir, Malheur County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Arritola Reservoir.   Whitewater Near Arritola Reservoir: Owyhee River - North Fork, OwyheeCounty, 10 miles away       Class III-IV - 18 miles long (Off Mud Flat Road to Three Forks) Owyhee River, -blank-County, 10 miles away       Class III+(V+) - 65 miles long (Garat Crossing to Three Forks) Owyhee River, MalheurCounty, 11 miles away       Class III-IV(V) - 37 miles long (Three Forks to Rome)