The Marblemount 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.
Showers likely
Chance of showers
Chance of showers
Mostly sunny
Mostly cloudy
Partly cloudy
Partly cloudy
7° on Nov. 14, 1955, the coldest reading for this week of the year since 1905. Next is 10° in 1911.
Marblemount’s center stands about 340 ft above sea level. Within three miles the land runs from 280 ft to 4,290 ft, a difference of 4,010 ft: mountain country. The highest named summit within 15 miles is Eldorado Peak, about 8,760 ft, 14 miles east.
Under the town center the state geologic map shows Glacial drift, undivided (sand, gravel), from the Pleistocene, less than 2.6 million 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 3×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite, granodiorite, trondhjemite. Age: Late Cretaceous to Eocene, 34 to 100 million years old. About 8 mi of the line.
Graywacke. Age: Late Devonian to Early Jurassic, 175 to 384 million years old. About 6 mi of the line.
Schist. Age: Late Jurassic to Early Cretaceous, 100 to 164 million years old. About 4 mi of the line.
Phyllite. Age: Jurassic to Early Cretaceous, 100 to 202 million years old. About 3 mi of the line.
Sand, gravel. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
Serpentinite. Age: Middle Jurassic to Late Jurassic, 145 to 175 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.
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 Marblemount reaches the Pacific Ocean by way of Olson Creek, the Skagit, the South Fork Skagit and Freshwater Slough: about 80 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Marblemount; river miles along the main stem, rounded.
Marblemount has a warm-summer Mediterranean climate. Summer afternoons average 77° in August; winter nights fall to about 34° in January. A normal year brings about 16 inches of snow; with the rain, that comes to about 71 inches of water.
On November 14 Marblemount normally reaches 49° and falls to 38°. The record high is 66°, in 1943; the record low 7°, in 1955. The most rain on this date, 2.09 in, fell in 2015.
Normals 1991–2020 and records since 1905 at Concrete Ppl Fish Station, 13 miles west, 140 ft lower. NOAA, through RCC-ACIS.
