Gallup City anchors the northwestern corner of this landscape, situated at the boundary of Pondera and Teton counties. The area is defined by a series of distinct drainage features known as coulees, including Aldrich Coulee, Kropp Coulee, and Maucki Coulee, which carve through the high plains. The topography is further marked by the prominent Porter Bench and the southern Eyraud Lakes. A network of specialized road names like Black Gold Rd, Oilfield Rd, and Pendrey Field Rd indicates the local economic focus on natural resource extraction and rural transport. Freshwater sources are scattered across the terrain, including Aldrich Spring, Noble Spring, and Healy Spring, which historically supported ranching and early settlement in this part of Montana.
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1886 · Great Falls
USGS Topo · 1:250,000
1920 · Choteau
USGS Topo · 1:125,000
1920 · Dupuyer
USGS Topo · 1:125,000
1920 · Conrad
USGS Topo · 1:125,000
1938 · Gallup City
USGS Topo · 1:62,500
1942 · Gallup City
USGS Topo · 1:62,500
1950 · Collins
USGS Topo · 1:62,500
1954 · Great Falls
USGS Topo · 1:250,000
1954 · Shelby
USGS Topo · 1:250,000
1955 · Choteau
USGS Topo · 1:250,000