
The Lower Rio Grande Valley National Wildlife Refuge and the Lrgvnwr dominate the western landscape of this Hidalgo County region, where the natural environment meets an extensive network of energy extraction and irrigation. The terrain is defined by its industrial productivity, anchored by the San Salvador Gas Field, San Carlos Gas Field, and La Blanca Gas Field. These fields sit alongside concentrated rural settlements like San Carlos, Evergreen, and Engleman Gardens, illustrating the close proximity of residential life to the Rio Grande Valley’s oil and gas infrastructure.
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This is the sole edition of this map. No revisions or reprints were ever made.
1914 · San Juan
USGS Topo · 1:48,000
1916 · San Juan
USGS Topo · 1:62,500
1949 · Mc Allen
USGS Topo · 1:250,000
1953 · Brownsville
USGS Topo · 1:250,000
1954 · McAllen
USGS Topo · 1:250,000
1956 · Mercedes
USGS Topo · 1:24,000
1956 · Brownsville
USGS Topo · 1:250,000
1956 · Port Isabel
USGS Topo · 1:250,000
1957 · Lasara
USGS Topo · 1:24,000
1957 · Edcouch
USGS Topo · 1:24,000