The Thayer 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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5.49 inches of rain fell in two days, the most for this week of the year since records began in 1904. The next wettest, 5.05 inches, fell in 2003.
Thayer’s center stands about 620 ft above sea level. Within three miles the land runs from 500 ft to 810 ft, a difference of 310 ft: rolling country. The highest named summit within 15 miles is Britton Hill, about 820 ft, 8 miles south-southeast.
Under the town center the state geologic map shows Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (dolostone), from the Early Ordovician, 471 to 487 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 32×. 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. Age: Early Ordovician, 471 to 487 million years old. About 14 mi of the line.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 10 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 Thayer reaches the Gulf of America by way of Twomile Creek, the Warm Fork, the Spring, the Black River, the White River and the Mississippi: about 1,010 river miles.
620 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Thayer; river miles along the main stem, rounded.
Thayer has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 23° in January. About 49 inches of rain fall in a normal year.
On November 14 Thayer normally reaches 60° and falls to 34°. The record high is 81°, in 1999; the record low 11°, in 1940. The most rain on this date, 1.60 in, fell in 1926.
Normals 1991–2020 and records since 1904 at Mammoth Spring, here, 120 ft lower. NOAA, through RCC-ACIS.
