The Clyde Park 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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77° on Nov. 12, 1999, the hottest reading for this week of the year since 1948. Next is 69° in 2016.
Clyde Park’s center stands about 4,850 ft above sea level. Within three miles the land runs from 4,730 ft to 5,330 ft, a difference of 600 ft: hilly country. The highest named summit within 15 miles is Grassy Mountain, about 7,590 ft, 13 miles west-southwest.
Under the town center the state geologic map shows Gravel, from the Late Miocene to Holocene, less than 7.2 million years old.
The section below crosses 4 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, siltstone. Age: Late Cretaceous to Middle Paleocene, 59 to 72 million years old. About 14 mi of the line.
Age: Late Miocene to Holocene, less than 7.2 million years old. About 8 mi of the line.
Plutonic. Age: Tertiary, 2.6 to 66 million years old. About 2 mi of the line.
Gravel, sand, silt. Age: Pleistocene to Holocene, less than 1.8 million years old. About 0.4 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 Clyde Park reaches the Gulf of America by way of Cottonwood Creek, the Shields, the Yellowstone, the Missouri and the Mississippi: about 3,250 river miles.
Lakes on the way: Lake Oahe, Lake Sakakawea, Lake Sharpe and Lake Francis Case.
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 Clyde Park; river miles along the main stem, rounded.
Clyde Park has a cold semi-arid climate. Summer afternoons average 86° in July; winter nights fall to about 19° in January. About 14 inches of rain fall in a normal year.
On November 14 Clyde Park normally reaches 46° and falls to 26°. The record high is 75°, in 1999; the record low −15°, in 1955. The most rain on this date, 0.49 in, fell in 1961.
Normals 1991–2020 and records since 1948 at Livingston Airport, 15 miles south-southeast, 200 ft lower. NOAA, through RCC-ACIS.
