The Loma 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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6° on Nov. 13, 1916, the coldest reading for this week of the year since 1893. Next is 8° in 1955.
Loma’s center stands about 4,520 ft above sea level. Within three miles the land runs from 4,440 ft to 5,110 ft, a difference of 670 ft: hilly country. The highest named summit within 15 miles is Monument Mesa, about 6,660 ft, 11 miles south-southeast.
Under the town center the state geologic map shows Mancos Shale (shale, sandstone), from the Early Cretaceous to Late Cretaceous, 66 to 145 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 7×. 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, sandstone. Age: Early Cretaceous to Late Cretaceous, 66 to 145 million years old. About 12 mi of the line.
Sandstone, mudstone, claystone. Age: Late Jurassic, 145 to 164 million years old. About 4 mi of the line.
Siltstone, shale, sandstone. Age: Late Triassic to Late Jurassic, 145 to 237 million years old. About 4 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Biotite-gneiss, schist, migmatite. Age: Paleoproterozoic, 1.6 to 2.5 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.
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 Loma reaches the Gulf of California by way of Reed Wash and the Colorado: about 1,140 river miles.
Lakes on the way: Lake Mead, Lake Powell, Lake Mohave and Lake Havasu.
Seldom reaches the sea. Dams and canals now take nearly all of the Colorado before its old delta in Mexico.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Loma; river miles along the main stem, rounded.
Loma has a cold semi-arid climate. Summer afternoons average 95° in July; winter nights fall to about 17° in January. A normal year brings about 18 inches of snow; with the rain, that comes to about 9 inches of water.
On November 14 Loma normally reaches 53° and falls to 28°. The record high is 72°, in 1903; the record low 8°, in 1916. The most rain on this date, 0.53 in, fell in 1987.
Normals 1991–2020 and records since 1893 from the Grand Junction Area threaded record (Grand Junction Walker Field, 15 miles east-southeast, 300 ft higher). NOAA, through RCC-ACIS.
