The Robie Creek 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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3° on Nov. 15, 2014, the coldest reading for this week of the year since 1973. Next is 12° in 1978.
Robie Creek’s center stands about 4,700 ft above sea level. Within three miles the land runs from 3,160 ft to 5,430 ft, a difference of 2,270 ft: mountain country. The highest named summit within 15 miles is Shafer Butte, about 7,560 ft, 8 miles north-northwest.
Under the town center the state geologic map shows Granodiorite and two-mica granite (granodiorite, granite), from the Early Cretaceous to Late Cretaceous, 67 to 107 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 5×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granodiorite, granite. Age: Early Cretaceous to Late Cretaceous, 67 to 107 million years old. About 21 mi of the line.
Granodiorite, quartz-monzodiorite, granite. Age: Early Eocene to Middle Eocene, 43 to 49 million years old. About 2 mi of the line.
Basalt. Age: Late Pliocene to Pleistocene, less than 3 million years old. About 1 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 Robie Creek reaches the Pacific Ocean by way of Robie Creek, the Boise, the Snake and the Columbia: about 790 river miles.
Lakes on the way: Lake Umatilla, Brownlee Reservoir, Arrowrock 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 Robie Creek; river miles along the main stem, rounded.
Robie Creek has a dry-summer hot-summer continental climate. Summer afternoons average 88° in July; winter nights fall to about 23° in January. A normal year brings about 57 inches of snow; with the rain, that comes to about 18 inches of water.
On November 14 Robie Creek normally reaches 47° and falls to 30°. The record high is 61°, in 2025; the record low 14°, in 1985. The most rain on this date, 0.54 in, fell in 2014.
Normals 1991–2020 and records since 1973 at Boise 7 N, 11 miles west-northwest, 820 ft lower. NOAA, through RCC-ACIS.
