The Lake Stevens 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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69° on Nov. 14, 2016, the hottest reading for this week of the year since 1894. Next is 67° in 1939.
Lake Stevens’s center stands about 220 ft above sea level. Within three miles the land runs from 110 ft to 580 ft, a difference of 470 ft: hilly country. The highest named summit within 15 miles is Mount Pilchuck, about 5,260 ft, 13 miles east-northeast.
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 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 9×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 9 mi of the line.
Silt, sand. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Argillite, graywacke. Age: Late Jurassic to Early Cretaceous, 100 to 164 million years old. About 2 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Sand, gravel. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
Gabbro, diorite. Age: Late Jurassic to Late Oligocene, 23 to 164 million years old. About 0.3 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 Lake Stevens reaches Puget Sound and the Pacific Ocean by way of Catherine Creek, Little Pilchuck Creek, the Pilchuck and the Snohomish: about 25 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lake Stevens; river miles along the main stem, rounded.
Lake Stevens has a warm-summer Mediterranean climate. Summer afternoons average 76° in August; winter nights fall to about 34° in February. About 40 inches of rain fall in a normal year.
On November 14 Lake Stevens normally reaches 53° and falls to 38°. The record high is 69°, in 2016; the record low 11°, in 1955. The most rain on this date, 1.30 in, fell in 1966.
Normals 1991–2020 and records since 1894 at Everett, 7 miles west-southwest, 170 ft lower. NOAA, through RCC-ACIS.
