The Alamillo 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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82° on Nov. 13, 1973, the hottest reading for this week of the year since 1893. Next is 81° in 1917.
Alamillo’s center stands about 4,660 ft above sea level. Within three miles the land runs from 4,650 ft to 5,140 ft, a difference of 490 ft: hilly country. The highest named summit within 15 miles is Polvadera Mountain, about 7,200 ft, 7 miles southwest.
Under the town center the state geologic map shows Alluvium (unconsolidated), from the Pleistocene to Holocene, less than 0.1 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 8×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Unconsolidated. Age: Pleistocene to Holocene, less than 0.1 million years old. About 8 mi of the line.
Conglomerate-sandstone, coarse-detrital, fine-detrital. Age: Late Miocene to Pleistocene, 0.1 to 7.2 million years old. About 6 mi of the line.
Unconsolidated. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Conglomerate-sandstone, coarse-detrital, fine-detrital. Age: Late Oligocene to Late Miocene, 5.3 to 28 million years old. About 3 mi of the line.
Basaltic-andesite, rhyolite. Age: Late Oligocene to Early Miocene, 16 to 28 million years old. About 2 mi of the line.
Granitic. Age: Mesoproterozoic, 1.2 to 1.6 billion years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit along the line are not listed.
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 Alamillo reaches the Gulf of America by way of the Rio Grande: about 1,480 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 Alamillo; river miles along the main stem, rounded.
Alamillo has a cold semi-arid climate. Summer afternoons average 91° in June; winter nights fall to about 23° in January. About 10 inches of rain fall in a normal year.
On November 14 Alamillo normally reaches 61° and falls to 31°. The record high is 77°, in 1973; the record low 12°, in 1916. The most rain on this date, 0.34 in, fell in 1924.
Normals 1991–2020 and records since 1893 at Socorro, 13 miles south. NOAA, through RCC-ACIS.
