The Wilderness Rim 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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2° on Nov. 15, 1955, the coldest reading for this week of the year since 1898. Next is 12° in 1911.
Wilderness Rim’s center stands about 1,060 ft above sea level. Within three miles the land runs from 460 ft to 3,250 ft, a difference of 2,790 ft: mountain country. The highest named summit within 15 miles is Kaleetan Peak, about 5,960 ft, 14 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 8 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.
Silt, sand. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Granodiorite, granite. Age: Early Paleocene to Middle Miocene, 12 to 66 million years old. About 5 mi of the line.
Andesite, basaltic-andesite. Age: Late Eocene, 34 to 38 million years old. About 4 mi of the line.
Andesite, basalt. Age: Eocene to Oligocene, 23 to 56 million years old. About 4 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Sandstone. Age: Early Eocene to Middle Eocene, 38 to 56 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. 2 smaller units 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 Wilderness Rim 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 Wilderness Rim; river miles along the main stem, rounded.
Wilderness Rim has a oceanic climate. Summer afternoons average 71° in August; winter nights fall to about 31° in December. A normal year brings about 42 inches of snow; with the rain, that comes to about 100 inches of water.
On November 14 Wilderness Rim normally reaches 44° and falls to 36°. The record high is 62°, in 1936; the record low 5°, in 1955. The most rain on this date, 6.16 in, fell in 1906.
Normals 1991–2020 and records since 1898 at Cedar Lake, 2 miles south-southeast, 520 ft higher. NOAA, through RCC-ACIS.
