The Rio Grande snakes through this high-altitude valley, defining a landscape shaped by an extensive network of irrigation and drainage infrastructure. This area of Alamosa County is a complex grid of water management, where major arteries like the San Luis Valley Canal and the Costilla Canal divert water across the plains. The presence of numerous smaller channels, such as the Excelsior Ditch and the Lower Centennial Ditch, underscores the region's historical reliance on engineering to support agriculture in the San Luis Valley.
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1915 · Del Norte
USGS Topo · 1:125,000
1917 · Del Norte
USGS Topo · 1:125,000
1922 · Conejos
USGS Topo · 1:125,000
1945 · Durango
USGS Topo · 1:250,000
1953 · Durango
USGS Topo · 1:250,000
1954 · Durango
USGS Topo · 1:250,000
1954 · Trinidad
USGS Topo · 1:250,000
1955 · Trinidad
USGS Topo · 1:250,000
1958 · Trinidad
USGS Topo · 1:250,000
1959 · Trinidad
USGS Topo · 1:250,000