The Dillard 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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15° on Nov. 15, 1955, the coldest reading for this week of the year since 1899. Next is 19° in 1961.
Dillard’s center stands about 520 ft above sea level. Within three miles the land runs from 480 ft to 1,440 ft, a difference of 960 ft: steep hill country. The highest named summit within 15 miles is Nickel Mountain, about 3,480 ft, 10 miles south.
Under the town center the state geologic map shows Alluvial deposits (sand, gravel, silt), from the Holocene, less than 12,000 years old.
The section below crosses 8 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.
Mudstone, sandstone. Age: Late Jurassic to Late Cretaceous, 66 to 164 million years old. About 6 mi of the line.
Sand, gravel, silt. Age: Holocene, less than 12,000 years old. About 6 mi of the line.
Basalt. Age: Paleocene to Middle Eocene, 38 to 66 million years old. About 3 mi of the line.
Graywacke, mudstone. Age: Late Jurassic, 145 to 153 million years old. About 3 mi of the line.
Peridotite, serpentinite. Age: Paleozoic to Jurassic, 145 to 542 million years old. About 2 mi of the line.
Siltstone, sandstone. Age: Late Jurassic to Early Cretaceous, 125 to 153 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. 2 smaller units along the line are not listed.
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 Dillard reaches the Pacific Ocean by way of the South Umpqua and the Umpqua: about 130 river miles.
110 miles of the trip are on the Umpqua.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dillard; river miles along the main stem, rounded.
Dillard has a warm-summer Mediterranean climate. Summer afternoons average 86° in July; winter nights fall to about 37° in January. About 32 inches of rain fall in a normal year.
On November 14 Dillard normally reaches 54° and falls to 41°. The record high is 68°, in 2001; the record low 17°, in 1955. The most rain on this date, 2.01 in, fell in 1941.
Normals 1991–2020 and records since 1899 at Roseburg Regional Airport, 9 miles north-northeast. NOAA, through RCC-ACIS.
