
Agricultural development and water management define this portion of the San Luis Valley in the late 1960s. The landscape is structured by an intensive network of numbered irrigation corridors, including Elevenmile Lane, Ninemile Lane, and Fivemile Lane, which crisscross the flat terrain between the settlements of Hooper and Mosca. These corridors are supported by complex water systems like the San Luis Valley Irrigation Drain and the Prairie Ditch, reflecting the region's reliance on managed water for farming. Local history is anchored by the Spelser Cem and numerous flowing wells and wells scattered across the township lines. The boundary between Saguache Co and Alamosa Co runs through the northern section, dividing the high-altitude valley floor where the grid of laterals and drains dictates the pattern of human settlement.
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1915 · Del Norte
USGS Topo · 1:125,000
1917 · Del Norte
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
1961 · Durango
USGS Topo · 1:250,000