The Grantsburg 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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4° on Nov. 13, 2019, the coldest reading for this week of the year since 1955. Next is 8° in 1959.
Grantsburg’s center stands about 640 ft above sea level. Within three miles the land runs from 470 ft to 830 ft, a difference of 360 ft: rolling country. The highest named summit within 15 miles is Pilot Knob, about 960 ft, 6 miles east.
Under the town center the state geologic map shows Stephensport Group (sandstone, limestone), from the Carboniferous, 324 to 359 million years old.
The section below crosses 5 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.
Sandstone, limestone. Age: Carboniferous, 324 to 359 million years old. About 11 mi of the line.
Sandstone. Age: Carboniferous, 324 to 359 million years old. About 5 mi of the line.
Sandstone, shale. Age: Carboniferous, 324 to 359 million years old. About 4 mi of the line.
Shale, sandstone. Age: Carboniferous, 299 to 324 million years old. About 1 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 0.9 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 Grantsburg reaches the Gulf of America by way of the Little Blue, the Ohio and the Mississippi: about 1,300 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Grantsburg; river miles along the main stem, rounded.
Grantsburg has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 19° in January. A normal year brings about 13 inches of snow; with the rain, that comes to about 52 inches of water.
On November 14 Grantsburg normally reaches 56° and falls to 32°. The record high is 79°, in 1955; the record low 11°, in 1986. The most rain on this date, 2.59 in, fell in 1957.
Normals 1991–2020 and records since 1955 at Dubois Srn In Forage Farm, 17 miles northwest. NOAA, through RCC-ACIS.
