The Donnellson 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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3.45 inches of rain fell in two days, the most for this week of the year since records began in 1895. The next wettest, 2.46 inches, fell in 1992.
Donnellson’s center stands about 620 ft above sea level. Within three miles the land runs from 530 ft to 660 ft, a difference of 130 ft: gently rolling country.
Under the town center the state geologic map shows Bond Formation (shale, sandstone, limestone), from the Late Pennsylvanian, 304 to 307 million years old.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. 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, sandstone, limestone. Age: Late Pennsylvanian, 304 to 307 million years old. About 24 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 Donnellson reaches the Gulf of America by way of Yankee Creek, Shoal Creek, the Kaskaskia and the Mississippi: about 1,220 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Donnellson; river miles along the main stem, rounded.
Donnellson has a hot-summer humid continental climate. Summer afternoons average 89° in July; winter nights fall to about 21° in January. About 42 inches of rain fall in a normal year.
On November 14 Donnellson normally reaches 55° and falls to 36°. The record high is 78°, in 1971; the record low 11°, in 1986. The most rain on this date, 2.25 in, fell in 1993.
Normals 1991–2020 and records since 1895 at Hillsboro, 9 miles north. NOAA, through RCC-ACIS.
