Twelvemile Coulee and Sixmile Coulee define the drainage patterns of this Chouteau County landscape, illustrating a region shaped by water management and rural accessibility. The map reveals an extensive network of earthen structures used for water retention, including Sumo Dam, Beirwagen Dam, and Moncarpic Dam, which are critical for supporting agriculture and livestock in this semiarid environment. A strictly organized grid of rural roads, such as Rudyard Rd, Stranahan Rd, and Houston Rd, provides the backbone for local transit between isolated homesteads and grazing lands. These features, along with the distinct paths of Spring Coulee and Dry Fork Coulee, show how the modern geography of north-central Montana remains deeply tied to the careful control of seasonal water flow through a series of named dams and natural coulees.
21 named features on this map. Tap any name to fly to it.
Don’t see what you’re looking for? This feature index may not catch every label — zoom into the map to look around manually.
This is the sole edition of this map. No revisions or reprints were ever made.
1890 · Fort Benton
USGS Topo · 1:250,000
1892 · Fort Benton
USGS Topo · 1:250,000
1897 · Fort Benton
USGS Topo · 1:250,000
1906 · Lonesome
USGS Topo · 1:62,500
1919 · Big Sandy
USGS Topo · 1:125,000
1953 · Boggs Island
USGS Topo · 1:24,000
1953 · Loma East
USGS Topo · 1:24,000
1953 · Loma West
USGS Topo · 1:24,000
1953 · Stranahan
USGS Topo · 1:24,000
1954 · Great Falls
USGS Topo · 1:250,000