The Simmesport 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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Simmesport’s center stands about 30 ft above sea level. Within three miles the land runs from 10 ft to 90 ft, a difference of 80 ft: gently rolling country. The highest named summit within 15 miles is Rock Hill, about 350 ft, 15 miles east-northeast.
The section below crosses 2 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.
Silt, clay. Age: Holocene, less than 12,000 years old. About 10 mi of the line.
Clay. Age: Holocene, less than 12,000 years old. About 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 Simmesport reaches the Gulf of America by way of Brushy Bayou, the Bayou Cason, the Bayou Rouge, the Atchafalaya and the Lower Atchafalaya: about 140 river miles.
75 miles of the trip are on the Atchafalaya.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Simmesport; river miles along the main stem, rounded.
