Ninemile Tank is a reservoir located in Hudspeth County, Texas. It appears on the Hobo Tank USGS 7.5-minute topographic quadrangle. The elevation at this location is approximately 5,081.52 feet (1,548.85 m) above sea level. The nearest populated place is Hueco Mountain Estates Number 7 Colonia, approximately 12.1 miles to the W.