The Rio Grande serves as the dominant geographical and political boundary in this 2019 survey of the Presidio County borderlands. Following the river's northern bank, FM 170—locally known as the River Road—winds through a landscape defined by deep erosional cuts and significant elevation changes. The north-bank topography is heavily dissected by numerous drainage systems, including Tapado Canyon, Rancherias Canyon, and Canyon Colorado, which descend from the higher interior toward the international boundary. Human transit is largely confined to the narrow corridor of the roadway and recreational paths like the Hoodoos Trail. The map documents the intricate relationship between the winding river course and the rugged desert terrain, illustrating where the United States of America Estados Unidos Mexicanos border follows the natural thalweg of the waterway.
9 named features on this map. Tap any name to fly to it.
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This is the sole edition of this map. No revisions or reprints were ever made.
1896 · Polvo
USGS Topo · 1:125,000
1903 · Terlingua
USGS Topo · 1:125,000
1904 · Terlingua
USGS Topo · 1:125,000
1931 · Lajitas
USGS Topo · 1:62,500
1959 · Emory Peak
USGS Topo · 1:250,000
1959 · Presidio
USGS Topo · 1:250,000
1965 · Presidio
USGS Topo · 1:250,000
1965 · Emory Peak
USGS Topo · 1:250,000
1971 · Redford SE
USGS Topo · 1:24,000
1971 · Agua Adentro Mountain
USGS Topo · 1:24,000