The Keithsburg 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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77° on Nov. 17, 2001, the hottest reading for this week of the year since 1938. Next is 76° in 1999.
Keithsburg’s center stands about 550 ft above sea level. Within three miles the land runs from 520 ft to 610 ft, a difference of 90 ft: gently rolling country.
Under the town center the state geologic map shows Muscatatuck Group (limestone), from the Middle Devonian, 384 to 394 million years old.
The section below crosses 6 rock units mapped at the surface.
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. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old. About 7 mi of the line.
Shale, siltstone. Age: Late Devonian, 359 to 374 million years old. About 5 mi of the line.
Limestone. Age: Middle Devonian, 384 to 394 million years old. About 4 mi of the line.
Dolostone, limestone. Age: Early Mississippian to Middle Mississippian, 331 to 359 million years old. About 3 mi of the line.
Limestone, dolostone. Age: Middle Devonian to Late Devonian, 374 to 388 million years old. About 3 mi of the line.
Shale. Age: Middle Devonian to Late Devonian, 359 to 388 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.
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 Keithsburg reaches the Gulf of America by way of the Mississippi: about 1,400 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Keithsburg; river miles along the main stem, rounded.
Keithsburg has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 15° in January. About 36 inches of rain fall in a normal year.
On November 14 Keithsburg normally reaches 50° and falls to 32°. The record high is 76°, in 1999; the record low 10°, in 1940. The most rain on this date, 0.82 in, fell in 1972.
Normals 1991–2020 and records since 1938 at New Boston Dam 17, 9 miles northwest. NOAA, through RCC-ACIS.
