The Junction City 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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78° on Nov. 11, 2019, the hottest reading for this week of the year since 1974. Next is 72° in 1995.
Junction City’s center stands about 1,500 ft above sea level. Within three miles the land runs from 1,420 ft to 4,590 ft, a difference of 3,170 ft: mountain country. The highest named summit within 15 miles is Little Granite Peak, about 7,920 ft, 14 miles north-northeast.
Under the town center the state geologic map shows Schist of various types and ages, unit 7 (Klamath Mountains) (amphibolite, schist), from the Devonian, 359 to 422 million years old.
The section below crosses 5 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.
Amphibolite, schist. Age: Devonian, 359 to 422 million years old. About 12 mi of the line.
Melange. Age: Devonian to Jurassic, 145 to 422 million years old. About 9 mi of the line.
Sandstone. Age: Oligocene to Miocene, 5.3 to 34 million years old. About 2 mi of the line.
Diorite. Age: Jurassic to Early Cretaceous, 100 to 202 million years old. About 1 mi of the line.
Mafic-volcanic, greenstone. Age: Paleozoic to Mesozoic, 66 to 542 million years old. About 0.7 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 Junction City reaches the Pacific Ocean by way of the Trinity and the Klamath: about 120 river miles.
80 miles of the trip are on the Trinity.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Junction City; river miles along the main stem, rounded.
Junction City has a hot-summer Mediterranean climate. Summer afternoons average 96° in July; winter nights fall to about 32° in December. A normal year brings about 6 inches of snow; with the rain, that comes to about 32 inches of water.
On November 14 Junction City normally reaches 59° and falls to 36°. The record high is 72°, in 2013; the record low 21°, in 1985. The most rain on this date, 1.04 in, fell in 1981.
Normals 1991–2020 and records since 1974 at Trinity River Hatchery, 14 miles east, 360 ft higher. NOAA, through RCC-ACIS.
