The Lyman 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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−18° on Nov. 16, 1978, the coldest reading for this week of the year since 1966. Next is −8° in 1997.
Lyman’s center stands about 6,710 ft above sea level. Within three miles the land runs from 6,490 ft to 6,790 ft, a difference of 300 ft: rolling country. The highest named summit within 15 miles is Haystack Butte, about 7,610 ft, 13 miles west-southwest.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 16×. 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, claystone. Age: Eocene, 34 to 56 million years old. About 16 mi of the line.
Clay, silt, sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 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.
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 Lyman reaches the Gulf of California by way of the Blacks Fork, the Green River and the Colorado: about 1,580 river miles.
Lakes on the way: Lake Mead, Lake Powell, Flaming Gorge Reservoir and Lake Mohave.
410 miles of the trip are on the Green River.
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 Lyman; river miles along the main stem, rounded.
Lyman has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 11° in January. A normal year brings about 64 inches of snow; with the rain, that comes to about 11 inches of water.
On November 14 Lyman normally reaches 42° and falls to 18°. The record high is 66°, in 1999; the record low −8°, in 1978. The most rain on this date, 0.25 in, fell in 2006.
Normals 1991–2020 and records since 1966 at Mountain View, 5 miles south-southwest. NOAA, through RCC-ACIS.
