Crowded Fish Slough is a lake located in Yukon-Koyukuk County, Alaska. It appears on the Nulato B-5 NE USGS 7.5-minute topographic quadrangle. The elevation at this location is approximately 107.46 feet (32.75 m) above sea level. The nearest populated place is Wolasatux, approximately 17.6 miles to the NNW.