The Uvalde Estates 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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Uvalde Estates’s center stands about 960 ft above sea level. Within three miles the land runs from 880 ft to 980 ft, a difference of 100 ft: gently rolling country. The highest named summit within 15 miles is Black Hill, about 1,330 ft, 15 miles north.
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 42×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 8 mi of the line.
Sandstone-mudstone. Age: Late Paleocene to Early Eocene, 48 to 59 million years old. About 4 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 4 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 145 million years old. About 4 mi of the line.
Gravel. Age: Late Pliocene to Pleistocene, less than 3.6 million years old. About 3 mi of the line.
Black-shale. Age: Late Cretaceous, 66 to 72 million years old. About 0.8 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 Uvalde Estates reaches Corpus Christi Bay and the Gulf of America by way of Cooks Slough, the Leona, the Frio and the Nueces: about 280 river miles.
Lakes on the way: Horseshoe Tank and Lake Corpus Christi.
75 miles of the trip are on the Leona.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Uvalde Estates; river miles along the main stem, rounded.
