The Cochran 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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3.31 inches of rain fell in two days, the most for this week of the year since records began in 1892. The next wettest, 3.19 inches, fell in 1930.
Cochran’s center stands about 350 ft above sea level. Within three miles the land runs from 300 ft to 450 ft, a difference of 150 ft: gently rolling country.
Under the town center the state geologic map shows Suwannee Limestone and its residuum, from the Oligocene, 23 to 34 million years old.
The section below crosses 3 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.
Limestone. Age: Oligocene, 23 to 34 million years old. About 19 mi of the line.
Sandstone, claystone. Age: Tertiary Neogene, 2.6 to 23 million years old. About 4 mi of the line.
Clay. Age: Eocene, 34 to 56 million years old. About 0.7 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 Cochran reaches the Atlantic Ocean by way of Jordan Creek, the Ocmulgee and the Altamaha: about 270 river miles.
130 miles of the trip are on the Ocmulgee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Cochran; river miles along the main stem, rounded.
Cochran has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 35° in January. About 48 inches of rain fall in a normal year.
On November 14 Cochran normally reaches 69° and falls to 42°. The record high is 86°, in 1955; the record low 24°, in 2013. The most rain on this date, 2.00 in, fell in 1940.
Normals 1991–2020 and records since 1892 at Hawkinsville, 10 miles southwest. NOAA, through RCC-ACIS.
