The Warden 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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Warden’s center stands about 1,300 ft above sea level. Within three miles the land runs from 1,140 ft to 1,430 ft, a difference of 290 ft: rolling country.
Under the town center the state geologic map shows Glaciolacustrine deposits (silt, sand), from the Pleistocene, less than 2.6 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 26×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Silt, sand. Age: Pleistocene, less than 2.6 million years old. About 9 mi of the line.
Silt. Age: Pleistocene, less than 2.6 million years old. About 7 mi of the line.
Basalt. Age: Late Oligocene to Early Pliocene, 3.6 to 28 million years old. About 6 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 0.7 mi of the line.
Silt, sand. Age: Holocene, less than 12,000 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 Warden reaches the Pacific Ocean by way of Potholes Reservoir, Lower Crab Creek and the Columbia: about 470 river miles.
Lakes on the way: Lake Umatilla and Potholes Reservoir.
210 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Warden; river miles along the main stem, rounded.
