The San Acacio plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
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−13° on Nov. 15, 1985, the coldest reading for this week of the year since 1906. Next is −12° in 1940.
San Acacio’s center stands about 7,720 ft above sea level. Within three miles the land runs from 7,620 ft to 8,040 ft, a difference of 420 ft: hilly country. The highest named summit within 15 miles is Piñon Hills, about 9,220 ft, 14 miles west-southwest.
Under the town center the state geologic map shows Gravels and alluviums (gravel, unconsolidated), from the Pleistocene, less than 0.5 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 9×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gravel, unconsolidated. Age: Pleistocene, less than 0.5 million years old. About 14 mi of the line.
Andesite. Age: Late Eocene to Early Oligocene, 30 to 35 million years old. About 5 mi of the line.
Siltstone, sandstone, conglomerate. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 4 mi of the line.
Basalt. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 0.9 mi of the line.
Unconsolidated. Age: Tertiary to Quaternary, less than 66 million years old. About 0.4 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in San Acacio reaches the Gulf of America by way of Culebra Creek and the Rio Grande: about 1,750 river miles.
Lakes on the way: Paz Ramirez Lake, Amistad Reservoir, Elephant Butte Reservoir and Caballo Reservoir.
760 miles of the trip are on the Rio Grande.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of San Acacio; river miles along the main stem, rounded.
San Acacio has a cold semi-arid climate. Summer afternoons average 83° in July; winter nights fall to about −1° in January. A normal year brings about 28 inches of snow; with the rain, that comes to about 7 inches of water.
On November 14 San Acacio normally reaches 49° and falls to 13°. The record high is 67°, in 2017; the record low −5°, in 1940. The most rain on this date, 0.54 in, fell in 1985.
Normals 1991–2020 and records since 1906 from the Alamosa Area threaded record (Alamosa-Bergman Field, 23 miles northwest, 180 ft lower). NOAA, through RCC-ACIS.
