The Alderton 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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3.67 inches of rain fell in two days, the most for this week of the year since records began in 1941. The next wettest, 3.42 inches, fell in 2001.
Alderton’s center stands about 90 ft above sea level. Within three miles the land runs from 50 ft to 670 ft, a difference of 620 ft: hilly country. The highest named summit within 15 miles is Gleason Hill, about 2,350 ft, 14 miles southeast.
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 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 11×. 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 11 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 5 mi of the line.
Fine-detrital, coarse-detrital. Age: Late Pliocene to Pleistocene, less than 3.6 million years old. About 5 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 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 Alderton reaches Puget Sound and the Pacific Ocean by way of the Puyallup: about 13 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Alderton; river miles along the main stem, rounded.
Alderton has a warm-summer Mediterranean climate. Summer afternoons average 77° in August; winter nights fall to about 33° in January. A normal year brings about 6 inches of snow; with the rain, that comes to about 45 inches of water.
On November 14 Alderton normally reaches 51° and falls to 36°. The record high is 63°, in 1975; the record low 4°, in 1955. The most rain on this date, 2.35 in, fell in 2001.
Normals 1991–2020 and records since 1941 at Mcmillin Reservoir, 3 miles south-southwest, 480 ft higher. NOAA, through RCC-ACIS.
