The Brazos 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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−10° on Nov. 13, 2000, the coldest reading for this week of the year since 1893. Next is −9° in 1955.
Brazos’s center stands about 7,390 ft above sea level. Within three miles the land runs from 7,260 ft to 7,950 ft, a difference of 690 ft: hilly country. The highest named summit within 15 miles is Grouse Mesa, about 11,420 ft, 10 miles east-northeast.
Under the town center the state geologic map shows Mancos Shale, from the Late Cretaceous, 72 to 100 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 5×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale. Age: Late Cretaceous, 72 to 100 million years old. About 13 mi of the line.
Felsic-volcanic, clastic, andesite. Age: Late Eocene to Early Oligocene, 28 to 38 million years old. About 4 mi of the line.
Sandstone. Age: Late Cretaceous, 94 to 100 million years old. About 3 mi of the line.
Sandstone, shale, limestone. Age: Middle Jurassic to Late Jurassic, 145 to 175 million years old. About 1 mi of the line.
Conglomerate, sandstone, shale. Age: Tertiary Paleogene, 23 to 66 million years old. About 1 mi of the line.
Sandstone, mudstone, conglomerate. Age: Middle Triassic to Late Triassic, 202 to 247 million years old. About 0.8 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 Brazos reaches the Gulf of America by way of the Rio Chama and the Rio Grande: about 1,740 river miles.
Lakes on the way: Paz Ramirez Lake, Amistad Reservoir, Elephant Butte Reservoir and El Vado 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 Brazos; river miles along the main stem, rounded.
Brazos has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 7° in January. A normal year brings about 92 inches of snow; with the rain, that comes to about 22 inches of water.
On November 14 Brazos normally reaches 48° and falls to 18°. The record high is 74°, in 1894; the record low −6°, in 1938. The most rain on this date, 1.26 in, fell in 1993.
Normals 1991–2020 and records since 1893 at Chama, 11 miles north, 460 ft higher. NOAA, through RCC-ACIS.
