
Horseshoe Valley and the surrounding prairie of McLean County are defined by a complex network of glacial potholes and seasonal wetlands, as seen in this early 1980s topographic study. The landscape is dominated by Long Lake and Crooked Lake, with significant portions of the terrain dedicated to conservation through the Camp Lake National Wildlife Refuge and the National Waterfowl Production Area. These protected spaces highlight the region's importance for migratory birds within the Great Plains flyway.
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This is the sole edition of this map. No revisions or reprints were ever made.
1929 · Kongsberg
USGS Topo · 1:62,500
1929 · Balfour
USGS Topo · 1:62,500
1945 · Pelican Lake
USGS Topo · 1:62,500
1947 · Pelican Lake
USGS Topo · 1:62,500
1947 · Turtle Lake
USGS Topo · 1:62,500
1954 · McClusky
USGS Topo · 1:250,000
1958 · McClusky
USGS Topo · 1:250,000
1958 · Butte
USGS Topo · 1:24,000
1958 · Balfour
USGS Topo · 1:62,500
1961 · Turtle Lake
USGS Topo · 1:24,000