The Lake Shastina 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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13° on Nov. 12, 2020, the coldest reading for this week of the year since 1948. Next is 16° in 2014.
Lake Shastina’s center stands about 2,850 ft above sea level. Within three miles the land runs from 2,650 ft to 3,570 ft, a difference of 920 ft: steep hill country. The highest named summit within 15 miles is Mount Shasta, about 14,110 ft, 12 miles southeast.
Under the town center the state geologic map shows Quaternary alluvium and marine deposits (coarse-detrital), from the Pleistocene to Holocene, 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 2×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Andesite, basalt. Age: Late Oligocene to Pleistocene, 2 to 24 million years old. About 10 mi of the line.
Dacite, andesite. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Andesite, basalt. Age: Late Pliocene to Pleistocene, less than 3.6 million years old. About 5 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, 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.
A raindrop that lands in Lake Shastina reaches the Pacific Ocean by way of the Shasta and the Klamath: about 220 river miles.
180 miles of the trip are on the Klamath.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lake Shastina; river miles along the main stem, rounded.
Lake Shastina has a hot-summer Mediterranean climate. Summer afternoons average 93° in July; winter nights fall to about 26° in January. About 12 inches of rain fall in a normal year.
On November 14 Lake Shastina normally reaches 55° and falls to 30°. The record high is 65°, in 2019; the record low 20°, in 2018. The most rain on this date, 0.38 in, fell in 1948.
Normals 1991–2020 and records since 1948 at Montague Siskiyou Airport, 18 miles north-northwest, 200 ft lower. NOAA, through RCC-ACIS.
