Heath serves as the primary focal point in this portion of Fergus County, situated near the confluence of several vital waterways. The hydrology of the region is dominated by the E Fork Big Spring Cr and Middle Fork Big Spring Cr, which carve through the landscape to form the distinctive Middle Fork Canyon. Further water management is evident at the East Fork Reservoir, which regulates the flow through these drainages.
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1889 · Big Snowy Mountain
USGS Topo · 1:250,000
1893 · Big Snowy Mountain
USGS Topo · 1:250,000
1941 · Lewistown
USGS Topo · 1:62,500
1941 · Judith Peak
USGS Topo · 1:62,500
1944 · Lewistown
USGS Topo · 1:62,500
1944 · Judith Peak
USGS Topo · 1:62,500
1954 · Roundup
USGS Topo · 1:250,000
1954 · Lewistown
USGS Topo · 1:250,000
1958 · Roundup
USGS Topo · 1:250,000
1959 · Lewistown
USGS Topo · 1:250,000