The Guernsey to State Line subbasin is located adjacent to the Wyoming-Nebraska State line and is the subbasin that contains the farthest-downstream reach of the North Platte River in Wyoming. It is also the smallest of the seven Platte River subbasins, covering about 1,100 square miles and is located almost entirely within Goshen County. The City of Torrington is located in the Guernsey to State Line subbasin, and the subbasin does not include any major North Platte River federal reservoirs.

Additional information and maps of the Guernsey to State Line subbasin can be accessed by using the menu displayed on the left or the navigational menu displayed on the top of this page.