The Oquawka 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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76° on Nov. 11, 2022, the hottest reading for this week of the year since 1938. Next is 75° in 1999.
Oquawka’s center stands about 560 ft above sea level. Within three miles the land runs from 520 ft to 690 ft, a difference of 170 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.
Limestone. Age: Early Mississippian to Middle Mississippian, 331 to 359 million years old. About 9 mi of the line.
Dolostone, limestone. Age: Early Mississippian to Middle Mississippian, 331 to 359 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.
Shale. Age: Middle Devonian to Late Devonian, 359 to 388 million years old. About 3 mi of the line.
Limestone. Age: Middle Devonian, 384 to 394 million years old. About 0.9 mi of the line.
Dolostone, limestone, siltstone. Age: Early Mississippian, 347 to 359 million years old. About 0.4 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 Oquawka reaches the Gulf of America by way of the Mississippi: about 1,390 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Oquawka; river miles along the main stem, rounded.
Oquawka has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 16° in January. A normal year brings about 17 inches of snow; with the rain, that comes to about 37 inches of water.
On November 14 Oquawka normally reaches 51° and falls to 33°. The record high is 75°, in 1999; the record low 7°, in 1940. The most rain on this date, 0.77 in, fell in 1972.
Normals 1991–2020 and records since 1938 at Gladstone L/D 18, 5 miles southwest. NOAA, through RCC-ACIS.
