The Bridgeport 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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Bridgeport’s center stands about 3,670 ft above sea level. Within three miles the land runs from 3,640 ft to 3,790 ft, a difference of 150 ft: gently rolling country. The highest named summit within 15 miles is Reilly Hill, about 4,400 ft, 11 miles northeast.
Under the town center the state geologic map shows White River Group (clay), from the Early Oligocene to Late 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 27×. 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. Age: Early Oligocene to Late Oligocene, 23 to 34 million years old. About 17 mi of the line.
Siltstone-mudstone, conglomerate-sandstone. Age: Miocene, 5.3 to 23 million years old. About 5 mi of the line.
Sand, volcanic. Age: Late Oligocene to Miocene, 5.3 to 28 million years old. About 3 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 Bridgeport reaches the Gulf of America by way of the North Platte, the Platte, the Missouri and the Mississippi: about 2,220 river miles.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Bridgeport; river miles along the main stem, rounded.
