Schley and Evaro anchor this mountain passage in Missoula County, where the landscape is defined by the steep transition between the Reservation Divide and the deep drainage of Marent Gulch. The area's complex topography is highlighted by the Coriacan Defile, a narrow pass used by transportation routes to navigate the high terrain of the Lolo National Forest. Water management and natural hydrology play a central role, with the E Canal and N Canal cutting across the slopes near Finley Creek and McClure Creek.
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1903 · Bonner
USGS Topo · 1:125,000
1912 · Missoula
USGS Topo · 1:125,000
1921 · Elbow Lake
USGS Topo · 1:125,000
1947 · Butte
USGS Topo · 1:250,000
1955 · Choteau
USGS Topo · 1:250,000
1956 · Wallace
USGS Topo · 1:250,000
1956 · Hamilton
USGS Topo · 1:250,000
1957 · Choteau
USGS Topo · 1:250,000
1958 · Butte
USGS Topo · 1:250,000
1958 · Choteau
USGS Topo · 1:250,000