Thompson Park sits at the high-elevation transition where the La Plata Mountains descend into canyon-carved terrain along the boundary of La Plata and Montezuma counties. This landscape is defined by the sharp relief of peaks such as Madden Peak and Menefee Mtn, alongside deep drainage systems like Joes Canyon and East Canyon. Water management is central to the area's development, evidenced by the Sponsel Reservoir and Cottonwood Reservoir which capture runoff from the San Juan National Forest.
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1895 · La Plata
USGS Topo · 1:62,500
1897 · La Plata
USGS Topo · 1:62,500
1899 · La Plata
USGS Topo · 1:62,500
1908 · La Plata
USGS Topo · 1:62,500
1912 · Soda Canyon
USGS Topo · 1:62,500
1913 · Red Mesa
USGS Topo · 1:62,500
1915 · Soda Canyon
USGS Topo · 1:62,500
1956 · Cortez
USGS Topo · 1:250,000
1958 · Cortez
USGS Topo · 1:250,000
1959 · Cortez
USGS Topo · 1:250,000