The Clark Fork river serves as the central artery for this region of Missoula County, shaping the settlement patterns of Primrose and Schilling. The landscape is defined by the transition from the river valley to the complex series of gulches to the west, including Sherman Gulch, Cyr Gulch, and Dog Gulch. Agricultural and industrial water management is visible through the Frenchtown Irrigation District Ditch and the Big Flat Ditch, which redirect water across the valley floor near the Grass Valley and Big Flat communities.
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1912 · Missoula
USGS Topo · 1:125,000
1956 · Wallace
USGS Topo · 1:250,000
1956 · Hamilton
USGS Topo · 1:250,000
1959 · Hamilton
USGS Topo · 1:250,000
1959 · Alberton
USGS Topo · 1:62,500
1959 · Arlee
USGS Topo · 1:62,500
1960 · Wallace
USGS Topo · 1:250,000
1960 · Hamilton
USGS Topo · 1:250,000
1963 · Primrose
USGS Topo · 1:24,000
1964 · Hamilton
USGS Topo · 1:250,000