Altnow Reservoir   Be the first to submit input for Altnow Reservoir. If you have info on Altnow Reservoir, Harney County, Oregon please submit it here to improve this web site.          These outdoors activities are available near Altnow Reservoir.   Lakes Near Altnow Reservoir: Warm Springs Reservoir, Malheur County, 15 miles away   Public Lands Near Altnow Reservoir: Malheur National Forest, Oregon, 20 miles away Unity Lake State Park, Oregon, 33 miles away