As seen on the map, the Pathfinder to Guernsey subbasin contains numerous creeks and tributaries of the North Platte River. Alcova, Gray Reef, Glendo, and Guernsey federal reservoirs are located within the Pathfinder to Guernsey subbasin. Alcova and Gray Reef Reservoirs are located in the southwestern portion of the subbasin while Glendo and Guernsey Reservoirs are located in the eastern portion of the subbasin.