The Lewis 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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0° on Nov. 17, 2000, the coldest reading for this week of the year since 1962. Next is 2° in 2018.
Lewis’s center stands about 6,700 ft above sea level. Within three miles the land runs from 6,520 ft to 7,040 ft, a difference of 520 ft: hilly country. The highest named summit within 15 miles is Ormiston Point, about 7,660 ft, 11 miles north.
Under the town center the state geologic map shows Eolian deposits (sand, silt), from the Quaternary, less than 2.6 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.
Sandstone, shale, conglomerate. Age: Early Cretaceous to Late Cretaceous, 66 to 145 million years old. About 12 mi of the line.
Sand, silt. Age: Quaternary, less than 2.6 million years old. About 7 mi of the line.
Sandstone, mudstone, claystone. Age: Late Jurassic, 145 to 164 million years old. About 4 mi of the line.
Sandstone, mudstone, claystone. Age: Late Jurassic, 145 to 164 million years old. About 1 mi of the line.
Sandstone, siltstone, shale. Age: Late Triassic to Early Jurassic, 175 to 237 million years old. About 0.2 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 Lewis reaches the Gulf of California by way of McElmo Creek, the San Juan and the Colorado: about 1,070 river miles.
Lakes on the way: Lake Mead, Lake Powell, Lake Mohave and Lake Havasu.
290 miles of the trip are on the Colorado.
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 Lewis; river miles along the main stem, rounded.
Lewis has a dry-summer hot-summer continental climate. Summer afternoons average 90° in July; winter nights fall to about 16° in January. About 15 inches of rain fall in a normal year.
On November 14 Lewis normally reaches 53° and falls to 26°. The record high is 71°, in 1999; the record low 7°, in 2018. The most rain on this date, 0.61 in, fell in 1962.
Normals 1991–2020 and records since 1962 at Yellow Jacket 2 W, 5 miles west-northwest, 230 ft higher. NOAA, through RCC-ACIS.
