The Deadwood 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.
Partly cloudy
Mostly sunny; warmer
Mostly sunny
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Mostly sunny; cooler
Partly cloudy
Chance of showers
73° on Nov. 12, 1999, the hottest reading for this week of the year since 1909. Next is 69° in 1953.
Deadwood’s center stands about 4,570 ft above sea level. Within three miles the land runs from 4,450 ft to 5,620 ft, a difference of 1,170 ft: steep hill country. The highest named summit within 15 miles is Terry Peak, about 7,040 ft, 6 miles west-southwest.
Under the town center the state geologic map shows Metamorphosed Shale (phyllite, slate, mica-schist), from the Paleoproterozoic, 1.6 to 2.5 billion years old.
The section below crosses 15 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Conglomerate, sandstone, shale. Age: Middle Cambrian to Late Ordovician, 445 to 521 million years old. About 4 mi of the line.
Sandstone, siltstone, shale. Age: Late Pennsylvanian to Permian, 273 to 307 million years old. About 4 mi of the line.
Limestone, dolostone. Age: Late Devonian to Early Mississippian, 347 to 384 million years old. About 3 mi of the line.
Sandstone, siltstone, claystone. Age: Middle Jurassic to Late Jurassic, 145 to 175 million years old. About 2 mi of the line.
Phyllite, schist. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 2 mi of the line.
Hypabyssal-trachyte, hypabyssal-quartz-trachyte, hypabyssal-rhyolite. Age: Paleocene to Eocene, 34 to 66 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. 9 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 Deadwood reaches the Gulf of America by way of Spring Creek, Whitewood Creek, the Belle Fourche, the Cheyenne, the Missouri and the Mississippi: about 2,540 river miles.
Lakes on the way: Lake Oahe, Lake Sharpe, Lake Francis Case and Lewis and Clark Lake.
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 Deadwood; river miles along the main stem, rounded.
Deadwood has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 18° in January. A normal year brings about 184 inches of snow; with the rain, that comes to about 32 inches of water.
On November 14 Deadwood normally reaches 47° and falls to 26°. The record high is 69°, in 1990; the record low −6°, in 1959. The most rain on this date, 1.91 in, fell in 1944.
Normals 1991–2020 and records since 1909 at Lead, here, 540 ft higher. NOAA, through RCC-ACIS.
