2017 Map of Pea Lake

About this map

Pea Lake and a series of livestock reservoirs dominate this arid segment of Phillips County along the international border with Canada. The landscape is defined by the drainage patterns of the E Fork Whitewater Cr, where several deep-cut coulees like Haukos Coulee and Gustin Coulee break the high plains terrain. This 2017 survey details a remote ranching environment where water management is critical, evidenced by named catchments such as Artie Reservoir, Lester Reservoir, and Ethel Reservoir. Isolated tracks including Anderson Cutacross Rd and Math Rd provide the only transit through these northern townships, following the natural contours of the land rather than a strict grid. The map captures the specialized geography of the Big Muddy Creek region, showing how human infrastructure like the Nerve Reservoir and Sarm Reservoir has been integrated into the natural coulee systems to support agricultural life in the Montana backcountry.