The Idaville 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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Idaville’s center stands about 40 ft above sea level. Within three miles the land runs from 0 ft to 1,830 ft, a difference of 1,830 ft: steep hill country. Open water lies within three miles. The highest named summit within 15 miles is Triangulation Point, about 3,250 ft, 14 miles northeast.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 7×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Basalt. Age: Middle Eocene to Late Eocene, 34 to 48 million years old. About 5 mi of the line.
Sand, gravel, silt. Age: Holocene, less than 12,000 years old. About 4 mi of the line.
Gravel, boulders, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Shale, siltstone. Age: Late Eocene to Oligocene, 23 to 38 million years old. About 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 Idaville reaches Tillamook Bay and the Pacific Ocean by way of Vaughn Creek and Tillamook Bay: about 8 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Idaville; river miles along the main stem, rounded.
