The Pecos River carves a winding path through this San Miguel County landscape, creating a geographic divide between the settlements of North San Ysidro and South San Ysidro. The area is characterized by a complex network of high mesas and deep drainages, including Gusano Mesa and the expansive Valle Grande to the south. Transportation in the early 21st century remains anchored to the corridor near Ilfeld, where local roads like San Jose Rd and County Rd B42A provide access to the river valley.
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1889 · Las Vegas
USGS Topo · 1:125,000
1889 · Santa Fe
USGS Topo · 1:125,000
1890 · Bernal
USGS Topo · 1:125,000
1891 · Bernal
USGS Topo · 1:125,000
1891 · Las Vegas
USGS Topo · 1:125,000
1893 · Las Vegas
USGS Topo · 1:125,000
1894 · Santa Fe
USGS Topo · 1:125,000
1894 · Bernal
USGS Topo · 1:125,000
1894 · Lamy
USGS Topo · 1:125,000
1954 · Santa Fe
USGS Topo · 1:250,000