The Oahe Acres 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
Sunny; warmer
Mostly sunny
Partly cloudy
Partly cloudy
Partly cloudy
Showers likely
78° on Nov. 14, 1990, the hottest reading for this week of the year since 1960. Next is 78° in 2016.
Oahe Acres’s center stands about 1,730 ft above sea level. Within three miles the land runs from 1,420 ft to 1,820 ft, a difference of 400 ft: rolling country. The highest named summit within 15 miles is Willow Creek Butte, about 2,080 ft, 14 miles west-southwest.
Under the town center the state geologic map shows Pierre Shale (shale, bentonite), from the Late Cretaceous, 66 to 100 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 42×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, bentonite. Age: Late Cretaceous, 66 to 100 million years old. About 23 mi of the line.
Coarse-detrital, fine-detrital. Age: Quaternary, less than 2.6 million years old. About 0.6 mi of the line.
Silt, sand. Age: Quaternary, less than 2.6 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 Oahe Acres reaches the Gulf of America by way of the Missouri and the Mississippi: about 2,230 river miles.
Lakes on the way: 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 Oahe Acres; river miles along the main stem, rounded.
Oahe Acres has a hot-summer humid continental climate. Summer afternoons average 89° in July; winter nights fall to about 8° in January. About 19 inches of rain fall in a normal year.
On November 14 Oahe Acres normally reaches 48° and falls to 24°. The record high is 78°, in 2016; the record low 5°, in 2011. The most rain on this date, 0.09 in, fell in 1997.
Normals 1991–2020 and records since 1960 at Oahe Dam, 4 miles west-southwest. NOAA, through RCC-ACIS.
