The Mill Spring 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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Mostly sunny; warmer
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8.48 inches of rain fell in two days, the most for this week of the year since records began in 1946. The next wettest, 4.29 inches, fell in 2015.
Mill Spring’s center stands about 490 ft above sea level. Within three miles the land runs from 430 ft to 820 ft, a difference of 390 ft: rolling country. The highest named summit within 15 miles is Clark Mountain, about 1,440 ft, 9 miles north.
Under the town center the state geologic map shows Gasconade Dolomite (dolostone), from the Early Ordovician, 471 to 487 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 40×. 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, chert. Age: Early Ordovician, 471 to 487 million years old. About 11 mi of the line.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 7 mi of the line.
Dolostone. Age: Cambrian, 487 to 497 million years old. About 6 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 Mill Spring reaches the Gulf of America by way of the Black River, the White River and the Mississippi: about 1,120 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 Mill Spring; river miles along the main stem, rounded.
Mill Spring has a humid subtropical climate. Summer afternoons average 89° in July; winter nights fall to about 23° in January. About 49 inches of rain fall in a normal year.
On November 14 Mill Spring normally reaches 58° and falls to 35°. The record high is 80°, in 1955; the record low 8°, in 1986. The most rain on this date, 0.90 in, fell in 1957.
Normals 1991–2020 and records since 1946 at Clearwater Dam, 7 miles northwest, 170 ft higher. NOAA, through RCC-ACIS.
