The Marietta-Alderwood 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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4.67 inches of rain fell in two days, the most for this week of the year since records began in 1949. The next wettest, 2.12 inches, fell in 2003.
Marietta-Alderwood’s center stands about 120 ft above sea level. Within three miles the land runs from 0 ft to 200 ft, a difference of 200 ft: gently rolling country. Open water lies within three miles. The highest named summit within 15 miles is Lookout Mountain, about 2,680 ft, 11 miles southeast.
Under the town center the state geologic map shows Younger glacial drift (fine-detrital, coarse-detrital), from the Pleistocene, less than 2.6 million 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 8×. 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.
Arkose. Age: Late Cretaceous to Eocene, 34 to 100 million years old. About 4 mi of the line.
Silt, sand. Age: Holocene, less than 12,000 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.
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.
Rain that falls on Marietta-Alderwood runs straight into the Pacific Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Marietta-Alderwood; river miles along the main stem, rounded.
Marietta-Alderwood has a warm-summer Mediterranean climate. Summer afternoons average 73° in July; winter nights fall to about 34° in January. About 35 inches of rain fall in a normal year.
On November 14 Marietta-Alderwood normally reaches 51° and falls to 38°. The record high is 63°, in 2004; the record low 9°, in 1955. The most rain on this date, 2.78 in, fell in 2021.
Normals 1991–2020 and records since 1949 at Bellingham International Airport, here. NOAA, through RCC-ACIS.
