The Eldorado 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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Eldorado’s center stands about 2,440 ft above sea level. Within three miles the land runs from 2,340 ft to 2,460 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Buda Limestone, from the Late Cretaceous, 66 to 100 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: Late Cretaceous, 66 to 100 million years old. About 15 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 113 million years old. About 9 mi of the line.
Clay, silt. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.3 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 Eldorado reaches the Gulf of America by way of the South Concho, the Concho and the Colorado: about 730 river miles.
Lakes on the way: Buchanan Lake, Lake Marble Falls, Lake Lyndon B Johnson and Twin Buttes Reservoir.
320 miles of the trip are on the Colorado.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Eldorado; river miles along the main stem, rounded.
