The Rio Grande defines the southern boundary of this border region, snaking through a landscape shaped by hydraulic engineering and specialized residential patterns. Significant infrastructure manages the river's flow, including the Main Floodway and North Floodway, which divert water away from settlements like Progreso and Weslaco. Large-scale water management is further evidenced by the Progreso District Settling Basin and Mercedes District Settling Basin, vital to the agricultural and residential needs of the valley.
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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 Maria
USGS Topo · 1:24,000
1929 · La Feria
USGS Topo · 1:24,000
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
1954 · McAllen
USGS Topo · 1:250,000
1956 · La Feria
USGS Topo · 1:24,000