The Uvalde 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’s center stands about 910 ft above sea level. Within three miles the land runs from 880 ft to 960 ft, a difference of 80 ft: gently rolling country. The highest named summit within 15 miles is Flag Mountain, about 1,480 ft, 14 miles north.
Under the town center the state geologic map shows Leona Formation (coarse-detrital, fine-detrital), from the Pleistocene, less than 2.6 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 37×. 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 6 mi of the line.
Limestone. Age: Late Cretaceous, 66 to 100 million years old. About 6 mi of the line.
Gravel. Age: Late Pliocene to Pleistocene, less than 3.6 million years old. About 5 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 145 million years old. About 5 mi of the line.
Sandstone-mudstone. Age: Late Paleocene to Early Eocene, 48 to 59 million years old. About 2 mi of the line.
Sandstone. Age: Eocene, 34 to 56 million years old. About 0.9 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit along the line are not listed.
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 reaches Corpus Christi Bay and the Gulf of America by way of the Leona, the Frio and the Nueces: about 280 river miles.
Lakes on the way: Horseshoe Tank and Lake Corpus Christi.
80 miles of the trip are on the Leona.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Uvalde; river miles along the main stem, rounded.
