The Dorris 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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73° on Nov. 12, 1996, the hottest reading for this week of the year since 1948. Next is 66° in 1959.
Dorris’s center stands about 4,240 ft above sea level. Within three miles the land runs from 4,080 ft to 5,110 ft, a difference of 1,030 ft: steep hill country. The highest named summit within 15 miles is Hamaker Mountain, about 6,580 ft, 8 miles north-northwest.
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 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 9×. 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 Pliocene to Pleistocene, less than 3.6 million years old. About 12 mi of the line.
Basaltic-andesite, basalt. Age: Quaternary, less than 2.6 million years old. About 8 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Basalt. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 1 mi of the line.
Basalt, andesite. Age: Miocene to Pleistocene, less than 23 million years old. About 0.3 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.
Dorris has a cold semi-arid climate. Summer afternoons average 86° in July; winter nights fall to about 20° in December. About 11 inches of rain fall in a normal year.
On November 14 Dorris normally reaches 50° and falls to 25°. The record high is 62°, in 2021; the record low 1°, in 1985. The most rain on this date, 0.45 in, fell in 1968.
Normals 1991–2020 and records since 1948 at Klamath Falls Ag Sta, 16 miles north-northeast, 150 ft lower. NOAA, through RCC-ACIS.
