Allen Reservoir   Be the first to submit input for Allen Reservoir. If you have info on Allen Reservoir, Malheur County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Allen Reservoir.   Lakes Near Allen Reservoir: Warm Springs Reservoir, Malheur County, 15 miles away   Public Lands Near Allen Reservoir: Malheur National Forest, Oregon, 33 miles away