The Calhoun 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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7.34 inches of rain fell in two days, the most for this week of the year since records began in 1892. The next wettest, 3.63 inches, fell in 2015.
Calhoun’s center stands about 170 ft above sea level. Within three miles the land runs from 100 ft to 260 ft, a difference of 160 ft: gently rolling country.
Under the town center the state geologic map shows Cockfield Formation (clay, silt, sand), from the Eocene, 34 to 56 million years old.
The section below crosses 5 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.
Clay, silt, sand. Age: Eocene, 34 to 56 million years old. About 13 mi of the line.
Clay. Age: Holocene, less than 12,000 years old. About 4 mi of the line.
Clay, marl. Age: Eocene, 34 to 56 million years old. About 3 mi of the line.
Clay. Age: Pleistocene, less than 2.6 million years old. About 0.8 mi of the line.
Clay, silt, sand. Age: Pleistocene, less than 2.6 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.
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 Calhoun reaches the Gulf of America by way of Curry Creek, North Cheniere Creek, the Ouachita, the Black River, the Red River, the Atchafalaya and the Lower Atchafalaya: about 340 river miles.
120 miles of the trip are on the Ouachita.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Calhoun; river miles along the main stem, rounded.
Calhoun has a humid subtropical climate. Summer afternoons average 94° in August; winter nights fall to about 37° in January. About 55 inches of rain fall in a normal year.
On November 14 Calhoun normally reaches 68° and falls to 44°. The record high is 86°, in 2011; the record low 23°, in 1907. The most rain on this date, 2.31 in, fell in 1947.
Normals 1991–2020 and records since 1892 from the Monroe Area threaded record (Monroe Regional Airport, 19 miles east). NOAA, through RCC-ACIS.
