The Edwardsville 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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4.26 inches of rain fell in two days, the most for this week of the year since records began in 1896. The next wettest, 3.35 inches, fell in 1995.
Edwardsville’s center stands about 1,200 ft above sea level. Within three miles the land runs from 920 ft to 1,380 ft, a difference of 460 ft: hilly country. The highest named summit within 15 miles is Flagpole Mountain, about 1,970 ft, 10 miles north.
Under the town center the state geologic map shows Chilhowee Group undifferentiated (arkose, conglomerate-sandstone, mudstone), from the Cambrian, 487 to 542 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 15×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Phyllite, quartzite. Age: Precambrian to Paleozoic. About 10 mi of the line.
Sandstone, conglomerate. Age: Cambrian, 487 to 542 million years old. About 6 mi of the line.
Arkose, conglomerate-sandstone, mudstone. Age: Cambrian, 487 to 542 million years old. About 5 mi of the line.
Dolostone. Age: Cambrian, 487 to 542 million years old. About 1 mi of the line.
Metasiltstone. Age: Cambrian, 487 to 542 million years old. About 1 mi of the line.
Mudstone, shale, siltstone. Age: Cambrian, 487 to 542 million years old. About 0.6 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit along the line are not listed.
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 Edwardsville reaches Mobile Bay and the Gulf of America by way of Terrapin Creek, the Coosa, the Alabama and the Mobile: about 620 river miles.
Lake on the way: Lay Lake.
310 miles of the trip are on the Alabama.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Edwardsville; river miles along the main stem, rounded.
Edwardsville has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 32° in January. About 53 inches of rain fall in a normal year.
On November 14 Edwardsville normally reaches 64° and falls to 39°. The record high is 81°, in 1955; the record low 23°, in 1968. The most rain on this date, 1.89 in, fell in 1972.
Normals 1991–2020 and records since 1896 at Cedartown, 16 miles northeast, 420 ft lower. NOAA, through RCC-ACIS.
