
Rio Grande waters dominate this San Luis Valley landscape, which is defined by an intricate network of irrigation infrastructure and drainage systems. The map details the complex hydraulic engineering required for high-altitude agriculture, featuring prominent arteries like the San Luis Valley Canal, Lower Centennial Ditch, and Costilla Canal. These waterways crisscross the valley floor, supporting the rural sections north of Alamosa. The settlement of Alamosa itself appears in the southeast corner, where the street grid begins to give way to recreational features like the Simpson Loop Trl. This documentation of the modern water system illustrates the persistent reliance on historic water rights and gravity-fed channels, including the Excelsior Ditch and Centennial Ditch, which remain central to the region's geographic identity and economic life.
37 named features on this map. Tap any name to fly to it.
Don’t see what you’re looking for? This feature index may not catch every label — zoom into the map to look around manually.
This is the sole edition of this map. No revisions or reprints were ever made.
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