The Friday Harbor 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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Friday Harbor’s center stands about 80 ft above sea level. Within three miles the land runs from 0 ft to 400 ft, a difference of 400 ft: hilly country. Open water lies within three miles. The highest named summit within 15 miles is Mount Constitution, about 2,410 ft, 13 miles northeast.
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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, gravel. Age: Pleistocene, less than 2.6 million years old. About 6 mi of the line.
Graywacke, argillite, phyllite. Age: Middle Jurassic to Eocene, 34 to 175 million years old. About 2 mi of the line.
Graywacke, argillite, siltstone. Age: Jurassic to Late Cretaceous, 66 to 202 million years old. About 1 mi of the line.
Quartz-diorite. Age: Cambrian to Early Triassic, 247 to 542 million years old. About 0.8 mi of the line.
Metasedimentary. Age: Devonian to Permian, 273 to 422 million years old. About 0.7 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.
Rain that falls on Friday Harbor runs straight into the Pacific Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Friday Harbor; river miles along the main stem, rounded.
