The North Bonneville 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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5.36 inches of rain fell in two days, the most for this week of the year since records began in 1937. The next wettest, 5.35 inches, fell in 1995.
North Bonneville’s center stands about 60 ft above sea level. Within three miles the land runs from 10 ft to 2,960 ft, a difference of 2,950 ft: mountain country. The highest named summit within 15 miles is Mount Defiance, about 4,950 ft, 12 miles east.
Under the town center the state geologic map shows Landslide and mudflow deposits (sand, clay, silt), from the Holocene, less than 12,000 years old.
The section below crosses 13 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, clay, silt. Age: Holocene, less than 12,000 years old. About 6 mi of the line.
Basaltic-andesite, basalt. Age: Early Pliocene to Pleistocene, 1.2 to 3.9 million years old. About 4 mi of the line.
Basalt. Age: Early Miocene to Middle Miocene, 12 to 23 million years old. About 4 mi of the line.
Andesite. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 4 mi of the line.
Basalt. Age: Late Oligocene to Early Pliocene, 3.6 to 28 million years old. About 1 mi of the line.
Sand, gravel, silt. Age: Holocene, less than 12,000 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. 7 smaller units along the line are not listed.
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 North Bonneville reaches the Pacific Ocean by way of the Columbia: about 140 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of North Bonneville; river miles along the main stem, rounded.
North Bonneville has a warm-summer Mediterranean climate. Summer afternoons average 80° in August; winter nights fall to about 34° in January. A normal year brings about 10 inches of snow; with the rain, that comes to about 80 inches of water.
On November 14 North Bonneville normally reaches 50° and falls to 40°. The record high is 67°, in 1999; the record low 19°, in 1955. The most rain on this date, 3.05 in, fell in 1941.
Normals 1991–2020 and records since 1937 at Bonneville Dam, here. NOAA, through RCC-ACIS.
