The Demopolis 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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3.88 inches of rain fell in two days, the most for this week of the year since records began in 1951. The next wettest, 3.44 inches, fell in 2009.
Demopolis’s center stands about 130 ft above sea level. Within three miles the land runs from 70 ft to 210 ft, a difference of 140 ft: gently rolling country. The highest named summit within 15 miles is Armstrong Hill, about 380 ft, 10 miles west.
Under the town center the state geologic map shows Selma Group; Demopolis Chalk, from the Cretaceous, 66 to 145 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand. Age: Holocene, less than 12,000 years old. About 9 mi of the line.
Sand, clay, sandstone. Age: Cretaceous, 66 to 145 million years old. About 6 mi of the line.
Chalk. Age: Cretaceous, 66 to 145 million years old. About 6 mi of the line.
Chalk, marl. Age: Cretaceous, 66 to 145 million years old. About 2 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 Demopolis reaches Mobile Bay and the Gulf of America by way of the Tombigbee and the Mobile: about 220 river miles.
170 miles of the trip are on the Tombigbee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Demopolis; river miles along the main stem, rounded.
Demopolis has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 34° in January. About 56 inches of rain fall in a normal year.
On November 14 Demopolis normally reaches 67° and falls to 42°. The record high is 83°, in 1955; the record low 19°, in 2013. The most rain on this date, 3.05 in, fell in 1957.
Normals 1991–2020 and records since 1951 at Demopolis Lock And Dam, 3 miles west. NOAA, through RCC-ACIS.
