
Weslaco and Mercedes anchor this study of the Rio Grande Valley, where a dense network of drainage ditches and floodways manages the flat, agricultural terrain. The landscape is defined by the intersection of traditional citrus and vegetable farming infrastructure with growing residential areas like Sunrise Hill and Heidelberg. Irrigation systems feeding off the Arroyo Colorado and Campacuas Lake dictate the layout of the land, while the presence of the Lacy-Mercedes gas field to the northeast points to the region's energy resources.
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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
1929 · Santa Rosa
USGS Topo · 1:24,000
1929 · Santa Maria
USGS Topo · 1:24,000
1929 · La Feria
USGS Topo · 1:24,000
1933 · Santa Rosa
USGS Topo · 1:31,680
1936 · La Feria
USGS Topo · 1:31,680
1936 · Santa Maria
USGS Topo · 1:31,680
1949 · Mc Allen
USGS Topo · 1:250,000
1953 · Brownsville
USGS Topo · 1:250,000