The Gallipolis 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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12° on Nov. 14, 1986, the coldest reading for this week of the year since 1912. Next is 13° in 1957.
Gallipolis’s center stands about 580 ft above sea level. Within three miles the land runs from 540 ft to 900 ft, a difference of 360 ft: rolling country. The highest named summit within 15 miles is Poplar Knob, about 1,020 ft, 9 miles west-southwest.
Under the town center the state geologic map shows Conemaugh Group (shale, siltstone, mudstone), from the Carboniferous, 299 to 324 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 44×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, siltstone, mudstone. Age: Carboniferous, 299 to 324 million years old. About 10 mi of the line.
Sandstone, siltstone, shale. Age: Carboniferous, 299 to 324 million years old. About 10 mi of the line.
Shale, siltstone. Age: Carboniferous, 299 to 324 million years old. About 1 mi of the line.
Fine-detrital, coarse-detrital. Age: Quaternary, less than 2.6 million years old. About 0.8 mi of the line.
Shale, siltstone, mudstone. Age: Carboniferous, 299 to 324 million years old. About 0.7 mi of the line.
Sandstone, siltstone, shale. Age: Carboniferous to Permian, 252 to 324 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 Gallipolis reaches the Gulf of America by way of Chickamauga Creek, the Ohio and the Mississippi: about 1,680 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Gallipolis; river miles along the main stem, rounded.
Gallipolis has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 23° in January. About 44 inches of rain fall in a normal year.
On November 14 Gallipolis normally reaches 57° and falls to 34°. The record high is 79°, in 1993; the record low 12°, in 1986. The most rain on this date, 1.42 in, fell in 2024.
Normals 1991–2020 and records since 1912 at Gallipolis, here. NOAA, through RCC-ACIS.
