The Eidson Road 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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Eidson Road’s center stands about 740 ft above sea level. Within three miles the land runs from 670 ft to 850 ft, a difference of 180 ft: gently rolling country. The highest named summit within 15 miles is Chapotal Hill, about 920 ft, 11 miles northeast.
Under the town center the state geologic map shows Escondido Formation (black-shale), from the Late Cretaceous, 66 to 72 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 61×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Black-shale. Age: Late Cretaceous, 66 to 72 million years old. About 9 mi of the line.
Gravel. Age: Late Pliocene to Pleistocene, less than 3.6 million years old. About 3 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 1 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 Eidson Road reaches the Gulf of America by way of the Rio Grande: about 490 river miles.
Lake on the way: Paz Ramirez Lake.
270 miles of the trip are on the Rio Grande.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Eidson Road; river miles along the main stem, rounded.
