The Lakehead 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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81° on Nov. 12, 2019, the hottest reading for this week of the year since 1943. Next is 80° in 1955.
Lakehead’s center stands about 1,170 ft above sea level. Within three miles the land runs from 1,030 ft to 3,280 ft, a difference of 2,250 ft: mountain country. The highest named summit within 15 miles is Red Mountain, about 6,740 ft, 14 miles northwest.
Under the town center the state geologic map shows Carboniferous marine rocks, unit 4 (Eastern Klamath Mountains) (mudstone, volcanic), from the Carboniferous to Permian, 273 to 359 million years old.
The section below crosses 3 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.
Mudstone, volcanic. Age: Carboniferous to Permian, 273 to 359 million years old. About 17 mi of the line.
Peridotite. Age: Ordovician, 445 to 487 million years old. About 5 mi of the line.
Mafic-volcanic. Age: Permian, 252 to 299 million years old. About 0.9 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 Lakehead reaches San Francisco Bay and the Pacific Ocean by way of the Sacramento: about 330 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lakehead; river miles along the main stem, rounded.
Lakehead has a hot-summer Mediterranean climate. Summer afternoons average 97° in July; winter nights fall to about 40° in January. About 63 inches of rain fall in a normal year.
On November 14 Lakehead normally reaches 63° and falls to 46°. The record high is 80°, in 1995; the record low 31°, in 2000. The most rain on this date, 6.50 in, fell in 1965.
Normals 1991–2020 and records since 1943 at Shasta Dam, 13 miles south. NOAA, through RCC-ACIS.
