The Copalis Beach 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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8.13 inches of rain fell in two days, the most for this week of the year since records began in 1987. The next wettest, 7.58 inches, fell in 1998.
Copalis Beach’s center stands about 20 ft above sea level. Within three miles the land runs from 0 ft to 230 ft, a difference of 230 ft: rolling country. Open water lies within three miles. The highest named summit within 15 miles is Macafee Hill, about 680 ft, 14 miles north-northeast.
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 36×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gravel, sand. Age: Pleistocene, less than 2.6 million years old. About 10 mi of the line.
Silt, sand. Age: Holocene, less than 12,000 years old. About 0.8 mi of the line.
Basalt. Age: Early Paleocene to Middle Eocene, 40 to 64 million years old. About 0.6 mi of the line.
Sand. Age: Holocene, less than 12,000 years old. About 0.4 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 Copalis Beach reaches the Pacific Ocean by way of the Copalis: about 2 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Copalis Beach; river miles along the main stem, rounded.
Copalis Beach has a oceanic climate. Summer afternoons average 70° in August; winter nights fall to about 34° in February. About 116 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Copalis Beach normally reaches 50° and falls to 36°. The record high is 60°, in 2001; the record low 26°, in 1993. The most rain on this date, 3.60 in, fell in 1998.
Normals 1991–2020 and records since 1987 at Humptulips Salmon Hatchery, 12 miles northeast, 120 ft higher. NOAA, through RCC-ACIS.
