Frank Nunley Lake and Martinena Ranch Lake serve as key water sources in this arid stretch of Webb County, where the landscape is defined by an intricate network of seasonal drainage. The hydrology of the region is dominated by several significant creeks, including Dolores Cr, Los Olmos Cr, and Venado Cr, which carve paths through the brush country. These waterways, alongside Carrizitos Cr, suggest a land primarily utilized for large-scale ranching operations, with the man-made lakes indicating the vital infrastructure necessary to sustain livestock in South Texas. The absence of concentrated settlements on this sheet highlights the rural and expansive nature of the local economy during this era.
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1929 · Cotulla
USGS Topo · 1:125,000
1953 · Crystal City
USGS Topo · 1:250,000
1955 · Crystal City
USGS Topo · 1:250,000
1956 · Becerra
USGS Topo · 1:62,500
1956 · Webb
USGS Topo · 1:62,500
1956 · Laredo
USGS Topo · 1:250,000
1957 · Encinal
USGS Topo · 1:62,500
1957 · Caiman Creek
USGS Topo · 1:62,500
1961 · Crystal City
USGS Topo · 1:250,000
1968 · Crystal City
USGS Topo · 1:250,000