The Glen 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.
Chance of showers
Partly cloudy
Mostly cloudy
Showers likely; cooler
Partly cloudy
Chance of showers
Chance of showers
69° on Nov. 12, 1990, the hottest reading for this week of the year since 1940. Next is 69° in 1999.
Glen’s center stands about 4,990 ft above sea level. Within three miles the land runs from 4,930 ft to 6,230 ft, a difference of 1,300 ft: steep hill country. The highest named summit within 15 miles is Torrey Mountain, about 11,080 ft, 14 miles west.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granitic. Age: Cretaceous, 66 to 145 million years old. About 7 mi of the line.
Sedimentary. Age: Tertiary, 2.6 to 66 million years old. About 6 mi of the line.
Age: Late Miocene to Holocene, less than 7.2 million years old. About 3 mi of the line.
Siltstone, sandstone, shale. Age: Early Triassic to Early Cretaceous, 100 to 252 million years old. About 2 mi of the line.
Sandstone, shale, siltstone. Age: Early Cretaceous to Late Cretaceous, 90 to 113 million years old. About 2 mi of the line.
Age: Pleistocene to Holocene, less than 1.8 million years old. About 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. 3 smaller units 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 Glen reaches the Gulf of America by way of Willow Creek, the Big Hole, the Jefferson, the Missouri and the Mississippi: about 3,580 river miles.
Lakes on the way: Lake Oahe, Lake Sakakawea, Lake Fort Peck and Lake Sharpe.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Glen; river miles along the main stem, rounded.
Glen has a cold semi-arid climate. Summer afternoons average 82° in July; winter nights fall to about 12° in December. About 10 inches of rain fall in a normal year.
On November 14 Glen normally reaches 41° and falls to 20°. The record high is 64°, in 2021; the record low −17°, in 1955. The most rain on this date, 0.15 in, fell in 1941.
Normals 1991–2020 and records since 1940 at Dillon Airport, 17 miles south-southeast, 210 ft higher. NOAA, through RCC-ACIS.
