
Ashley National Forest dominates this landscape along the border of Duchesne and Uintah counties, where the high terrain of Ice Cave Peak and Mosby Mtn gives way to deep drainages like Bridger Canyon and Ralphs Canyon. Water management is central to the area's history, as evidenced by the complex network of the Farm Creek Canal, Whiterocks Canal, and Mosby Canal that diverts water from the Whiterocks River and Farm Creek for use in the lower elevations.
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1885 · Ashley
USGS Topo · 1:250,000
1885 · Uinta
USGS Topo · 1:250,000
1905 · Gilbert Peak
USGS Topo · 1:125,000
1906 · Gilbert Peak
USGS Topo · 1:125,000
1906 · Marsh Peak
USGS Topo · 1:125,000
1908 · Marsh Peak
USGS Topo · 1:125,000
1917 · Vernal
USGS Topo · 1:125,000
1939 · Duchesne
USGS Topo · 1:125,000
1954 · Salt Lake City
USGS Topo · 1:250,000
1954 · Vernal
USGS Topo · 1:250,000