The Dalton Gardens 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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68° on Nov. 13, 1999, the hottest reading for this week of the year since 1895. Next is 61° in 1995.
Dalton Gardens’s center stands about 2,260 ft above sea level. Within three miles the land runs from 2,190 ft to 3,790 ft, a difference of 1,600 ft: steep hill country. The highest named summit within 15 miles is South Chilco Mountain, about 5,670 ft, 14 miles northeast.
Under the town center the state geologic map shows Missoula Flood deposits (gravel, sand, silt), from the Pleistocene, less than 20,000 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.
Gravel, sand, silt. Age: Pleistocene, less than 20,000 years old. About 7 mi of the line.
Quartzite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 6 mi of the line.
Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.
Age: Paleoproterozoic, 1.9 to 1.9 billion years old. About 3 mi of the line.
Metasiltstone, quartzite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
Tonalite, granodiorite, quartz-diorite. Age: Late Cretaceous, 70 to 100 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 Dalton Gardens reaches the Pacific Ocean by way of Fernan Creek, the Spokane and the Columbia: about 750 river miles.
Lakes on the way: Harrison Slough and Lake Umatilla.
360 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dalton Gardens; river miles along the main stem, rounded.
Dalton Gardens has a dry-summer warm-summer continental climate. Summer afternoons average 83° in July; winter nights fall to about 26° in January. About 25 inches of rain fall in a normal year.
On November 14 Dalton Gardens normally reaches 45° and falls to 32°. The record high is 63°, in 1999; the record low 0°, in 1955. The most rain on this date, 1.08 in, fell in 1937.
Normals 1991–2020 and records since 1895 at Coeur D'Alene, 4 miles south-southwest, 130 ft lower. NOAA, through RCC-ACIS.
