The Riverbend 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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Riverbend’s center stands about 520 ft above sea level. Within three miles the land runs from 450 ft to 3,360 ft, a difference of 2,910 ft: mountain country. The highest named summit within 15 miles is Kaleetan Peak, about 5,960 ft, 13 miles east.
Under the town center the state geologic map shows Alluvium (silt, sand), from the Holocene, less than 12,000 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 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granodiorite, granite. Age: Early Paleocene to Middle Miocene, 12 to 66 million years old. About 6 mi of the line.
Silt, sand. Age: Holocene, less than 12,000 years old. About 6 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Siltstone, sandstone. Age: Middle Eocene to Late Eocene, 34 to 48 million years old. About 3 mi of the line.
Andesite, basalt. Age: Eocene to Oligocene, 23 to 56 million years old. About 2 mi of the line.
Graywacke, argillite, phyllite. Age: Middle Jurassic to Eocene, 34 to 175 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. 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 Riverbend reaches Puget Sound and the Pacific Ocean by way of the South Fork Snoqualmie, the Snoqualmie and the Snohomish: about 70 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Riverbend; river miles along the main stem, rounded.
