The Pomeroy 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.
Pomeroy’s center stands about 810 ft above sea level. Within three miles the land runs from 540 ft to 910 ft, a difference of 370 ft: rolling country.
Under the town center the state geologic map shows Monongahela Group (shale, siltstone, mudstone), from the Carboniferous, 299 to 324 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 43×. 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 7 mi of the line.
Shale, siltstone, mudstone. Age: Carboniferous, 299 to 324 million years old. About 6 mi of the line.
Fine-detrital, coarse-detrital. Age: Quaternary, less than 2.6 million years old. About 6 mi of the line.
Sandstone, siltstone, shale. Age: Carboniferous, 299 to 324 million years old. About 3 mi of the line.
Mudstone, shale, siltstone. Age: Carboniferous to Permian, 252 to 324 million years old. About 2 mi of the line.
Sandstone, siltstone, shale. Age: Carboniferous to Permian, 252 to 324 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.
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 Pomeroy reaches the Gulf of America by way of the Ohio and the Mississippi: about 1,690 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 Pomeroy; river miles along the main stem, rounded.
Pomeroy 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 Pomeroy 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, 17 miles south-southwest, 230 ft lower. NOAA, through RCC-ACIS.
