The Walkerville 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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70° on Nov. 12, 1999, the hottest reading for this week of the year since 1894. Next is 66° in 1894.
Walkerville’s center stands about 6,300 ft above sea level. Within three miles the land runs from 5,310 ft to 6,880 ft, a difference of 1,570 ft: steep hill country. The highest named summit within 15 miles is Haystack Mountain, about 8,780 ft, 13 miles northeast.
Under the town center the state geologic map shows Granitic rock, from the Cretaceous, 66 to 145 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 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granitic. Age: Cretaceous, 66 to 145 million years old. About 14 mi of the line.
Quartz-latite. Age: Early Eocene to Middle Eocene, 41 to 56 million years old. About 9 mi of the line.
Sedimentary. Age: Tertiary, 2.6 to 66 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 Walkerville reaches the Pacific Ocean by way of Silver Bow Creek, the Clark Fork, the Pend Oreille and the Columbia: about 1,220 river miles.
Lakes on the way: Lake Pend Oreille, Lake Umatilla and Noxon Rapids Reservoir.
460 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Walkerville; river miles along the main stem, rounded.
Walkerville has a cold semi-arid climate. Summer afternoons average 81° in July; winter nights fall to about 7° in December. About 13 inches of rain fall in a normal year.
On November 14 Walkerville normally reaches 41° and falls to 16°. The record high is 69°, in 1999; the record low −25°, in 1955. The most rain on this date, 0.40 in, fell in 1903.
Normals 1991–2020 and records since 1894 at Butte Bert Mooney Airport, 5 miles south-southeast, 800 ft lower. NOAA, through RCC-ACIS.
