The Donnelly 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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63° on Nov. 12, 1999, the hottest reading for this week of the year since 1905. Next is 62° in 1934.
Donnelly’s center stands about 4,860 ft above sea level. Within three miles the land runs from 4,820 ft to 4,890 ft, a difference of 70 ft: gently rolling country. The highest named summit within 15 miles is Square Top, about 8,610 ft, 14 miles east.
Under the town center the state geologic map shows Glacial deposits (coarse-detrital, fine-detrital), from the Pleistocene, less than 2.6 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 7×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 6 mi of the line.
Tonalite, granodiorite, quartz-diorite. Age: Late Cretaceous, 70 to 100 million years old. About 5 mi of the line.
Granodiorite, granite. Age: Early Cretaceous to Late Cretaceous, 67 to 107 million years old. About 4 mi of the line.
Granodiorite, tonalite, quartz-diorite. Age: Late Jurassic to Late Cretaceous, 87 to 160 million years old. About 4 mi of the line.
Basalt, basaltic-andesite. Age: Early Miocene to Late Miocene, 6 to 18 million years old. About 4 mi of the line.
Age: Mesoproterozoic to Paleozoic, 252 to 1,600 million years old. About 0.4 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 Donnelly reaches the Pacific Ocean by way of Lake Cascade, the North Fork Payette, the Payette, the Snake and the Columbia: about 810 river miles.
Lakes on the way: Lake Cascade, Lake Umatilla, Brownlee Reservoir and Hells Canyon Reservoir.
240 miles of the trip are on the Snake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Donnelly; river miles along the main stem, rounded.
Donnelly has a dry-summer warm-summer continental climate. Summer afternoons average 81° in July; winter nights fall to about 14° in January. About 23 inches of rain fall in a normal year.
On November 14 Donnelly normally reaches 41° and falls to 22°. The record high is 59°, in 1999; the record low 1°, in 1916. The most rain on this date, 0.86 in, fell in 1973.
Normals 1991–2020 and records since 1905 from the McCall Area threaded record (Mccall Airport, 11 miles north, 160 ft higher). NOAA, through RCC-ACIS.
