The Parkdale 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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Parkdale’s center stands about 1,740 ft above sea level. Within three miles the land runs from 1,330 ft to 2,960 ft, a difference of 1,630 ft: steep hill country. The highest named summit within 15 miles is Mount Hood, about 11,150 ft, 11 miles south-southwest.
Under the town center the state geologic map shows Lacustrine and fluvial sedimentary rocks (clay, 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 2×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Basaltic-andesite, basalt. Age: Early Pliocene to Pleistocene, 1.2 to 3.9 million years old. About 8 mi of the line.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 7 mi of the line.
Basaltic-andesite, andesite. Age: Quaternary, less than 2.6 million years old. About 6 mi of the line.
Basalt. Age: Early Miocene to Middle Miocene, 12 to 23 million years old. About 2 mi of the line.
Age: Holocene, less than 12,000 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 Parkdale reaches the Pacific Ocean by way of Emil Creek, the East Fork Hood, the Hood and the Columbia: about 180 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Parkdale; river miles along the main stem, rounded.
