
Clark Fork winds through this landscape northwest of Missoula, anchoring a valley defined by complex water management and the transition from the Lolo National Forest to agricultural plains. The map reveals an intricate network of irrigation systems including the Frenchtown Irrigation District Ditch and the Grass Valley French Ditch, which support the lowlands of Big Flat and Grass Valley.
87 named features on this map. Tap any name to fly to it.
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This is the sole edition of this map. No revisions or reprints were ever made.
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