The Sequatchie 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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11° on Nov. 15, 1969, the coldest reading for this week of the year since 1896. Next is 16° in 2019.
Sequatchie’s center stands about 670 ft above sea level. Within three miles the land runs from 610 ft to 1,760 ft, a difference of 1,150 ft: steep hill country. The highest named summit within 15 miles is Scott Hill, about 2,070 ft, 15 miles north-northwest.
The section below crosses 11 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 12×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Conglomerate. Age: Carboniferous, 299 to 324 million years old. About 9 mi of the line.
Limestone, dolostone. Age: Ordovician, 445 to 487 million years old. About 5 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 3 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 2 mi of the line.
Shale, limestone. Age: Ordovician, 445 to 487 million years old. About 1 mi of the line.
Limestone. Age: Ordovician, 445 to 487 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 5 smaller units 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 Sequatchie reaches the Gulf of America by way of Clear Spring Branch, the Sequatchie, the Tennessee, the Ohio and the Mississippi: about 1,450 river miles.
Lakes on the way: Guntersville Lake, White Lake (historical), Pickwick Lake and Cummings Lake.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Sequatchie; river miles along the main stem, rounded.
Sequatchie has a humid subtropical climate. Summer afternoons average 88° in July; winter nights fall to about 29° in January. About 60 inches of rain fall in a normal year.
On November 14 Sequatchie normally reaches 61° and falls to 38°. The record high is 79°, in 1964; the record low 21°, in 2019. The most rain on this date, 2.03 in, fell in 1929.
Normals 1991–2020 and records since 1896 at Bridgeport 5 NW, 15 miles southwest. NOAA, through RCC-ACIS.
