Mixen Tank is a reservoir located in Otero County, New Mexico. It appears on the Alamo Mountain USGS 7.5-minute topographic quadrangle. The elevation at this location is approximately 4,960.40 feet (1,511.93 m) above sea level. The nearest populated place is Hueco Mountain Estates Number 7 Colonia, approximately 17.1 miles to the WSW.