The northern reaches of the San Luis Valley are defined by an intricate network of waterways and irrigation infrastructure, as shown in this 2019 survey of Saguache County. The landscape is split between the elevated McIntyre Ridge to the north and the low-lying wetlands fed by Saguache Cr and its northern branch. Human engineering is visible through long-standing water management features like the Taylor Ashley Ditch and the Rio Grande Canal, which traverse the flat valley floor to support local agriculture. The eponymous Hickey Bridge provides a vital crossing point over the N Br Saguache Cr amidst a grid of county roads. These labeled channels and named gulches, such as De Tilla Gulch and Proffit Gulch, reveal the historical reliance on water diversion in this high-altitude basin.
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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
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
1954 · Pueblo
USGS Topo · 1:250,000
1955 · Trinidad
USGS Topo · 1:250,000
1956 · Montrose
USGS Topo · 1:250,000
1957 · Pueblo
USGS Topo · 1:250,000