Helen Dixon Number 1 Reservoir (historical) is a reservoir located in Niobrara County, Wyoming. It appears on the Garland Draw USGS 7.5-minute topographic quadrangle. The elevation at this location is approximately 4,080.56 feet (1,243.75 m) above sea level. The nearest populated place is Underwood Crossing, approximately 15.0 miles to the WNW.