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 790 ft above sea level. Within three miles the land runs from 730 ft to 920 ft, a difference of 190 ft: gently rolling country. The highest named summit within 15 miles is Armstrong Mountain, about 1,190 ft, 13 miles west-southwest.
Under the town center the state geologic map shows Antlers Sand (sandstone, claystone), from the Early Cretaceous, 100 to 145 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 59×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, claystone. Age: Early Cretaceous, 100 to 145 million years old. About 11 mi of the line.
Claystone, sandstone. Age: Early Cretaceous, 100 to 145 million years old. About 6 mi of the line.
Limestone. Age: Carboniferous, 299 to 324 million years old. About 5 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.8 mi of the line.
Sandstone-mudstone. Age: Carboniferous, 299 to 324 million years old. About 0.4 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 Galveston Bay and the Gulf of America by way of Turkey Creek, the West Fork Trinity and the Trinity: about 570 river miles.
Lakes on the way: Woodlands Golf Course Lake, Eagle Mountain Lake and Lake Worth.
270 miles of the trip are on the Trinity.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Bridgeport; river miles along the main stem, rounded.
