Arrien Reservoir   Be the first to submit input for Arrien Reservoir. If you have info on Arrien Reservoir, Malheur County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Arrien Reservoir.   Lakes Near Arrien Reservoir: Warm Springs Reservoir, Malheur County, 19 miles away   Public Lands Near Arrien Reservoir: Malheur National Forest, Oregon, 38 miles away