The seasonal waterways of the South Texas brush country define this portion of Webb County, where ephemeral streams like Venado Creek and Carrizitos Cr carve through a landscape of gentle draws and breaks. Water management is central to the land's utility in this semi-arid region, evidenced by the presence of Martinena Ranch Lake and Frank Nunley Lake, which likely serve as vital stock tanks for local ranching operations. The dendritic drainage pattern of Los Olmos Cr and its tributaries, such as Dolores Cr, illustrates the natural flow of runoff toward larger basins. Apart from the established corridor of Ranch Rd 863 in the northeast corner, the area remains dominated by large private holdings and rugged ranchland, typical of the Rio Grande Plain's interior.
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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