The Bly 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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Bly’s center stands about 4,360 ft above sea level. Within three miles the land runs from 4,330 ft to 5,210 ft, a difference of 880 ft: hilly country. The highest named summit within 15 miles is Gearhart Mountain, about 8,320 ft, 11 miles northeast.
Under the town center the state geologic map shows Basalt, from the Early Miocene to Middle Miocene, 12 to 23 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 6×. 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: Miocene to Pliocene, 2.6 to 23 million years old. About 8 mi of the line.
Basalt, andesite. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 7 mi of the line.
Age: Early Miocene to Middle Miocene, 12 to 23 million years old. About 4 mi of the line.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Sand, gravel, silt. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Sandstone-mudstone. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 0.8 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 Bly reaches the Pacific Ocean by way of the South Fork Sprague, the Sprague, the Williamson, the Link and the Klamath: about 370 river miles.
250 miles of the trip are on the Klamath.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Bly; river miles along the main stem, rounded.
