The Lake Carroll 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.
Sunny
Mostly sunny
Mostly sunny
Mostly sunny
Partly cloudy
Partly cloudy
Chance of showers
−2° on Nov. 12, 2019, the coldest reading for this week of the year since 1895. Next is −1° in 1898.
Lake Carroll’s center stands about 850 ft above sea level. Within three miles the land runs from 660 ft to 930 ft, a difference of 270 ft: rolling country. The highest named summit within 15 miles is Simmons Mound, about 1,070 ft, 14 miles north-northwest.
Under the town center the state geologic map shows Silurian System undivided (dolostone, limestone), from the Silurian, 422 to 445 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 47×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone, limestone. Age: Silurian, 422 to 445 million years old. About 13 mi of the line.
Shale, limestone. Age: Late Ordovician, 445 to 454 million years old. About 4 mi of the line.
Dolostone, limestone. Age: Late Ordovician, 447 to 459 million years old. About 4 mi of the line.
Dolostone, limestone. Age: Late Ordovician, 454 to 459 million years old. About 3 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 Lake Carroll reaches the Gulf of America by way of the East Plum, the Plum and the Mississippi: about 1,550 river miles.
Lake on the way: Spring Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lake Carroll; river miles along the main stem, rounded.
Lake Carroll has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 11° in January. A normal year brings about 33 inches of snow; with the rain, that comes to about 40 inches of water.
On November 14 Lake Carroll normally reaches 49° and falls to 28°. The record high is 73°, in 1999; the record low 3°, in 1986. The most rain on this date, 1.30 in, fell in 1899.
Normals 1991–2020 and records since 1895 at Mount Carroll, 7 miles southwest, 140 ft lower. NOAA, through RCC-ACIS.
