The Hillrose 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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−11° on Nov. 16, 1955, the coldest reading for this week of the year since 1937. Next is −10° in 1940.
Hillrose’s center stands about 4,170 ft above sea level. Within three miles the land runs from 4,130 ft to 4,300 ft, a difference of 170 ft: gently rolling country. The highest named summit within 15 miles is Twin Hills, about 4,760 ft, 14 miles west-northwest.
Under the town center the state geologic map shows Gravels and alluviums (gravel, unconsolidated), from the Pleistocene, less than 0.5 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 40×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, silt. Age: Quaternary, less than 2.6 million years old. About 16 mi of the line.
Gravel, unconsolidated. Age: Pleistocene, 0.2 to 1.6 million years old. About 3 mi of the line.
Gravel, unconsolidated. Age: Pleistocene, less than 0.5 million years old. About 3 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 1 mi of the line.
Shale. Age: Late Cretaceous, 66 to 100 million years old. About 0.9 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 Hillrose reaches the Gulf of America by way of the South Platte, the Platte, the Missouri and the Mississippi: about 2,260 river miles.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hillrose; river miles along the main stem, rounded.
Hillrose has a cold semi-arid climate. Summer afternoons average 89° in July; winter nights fall to about 17° in January. About 15 inches of rain fall in a normal year.
On November 14 Hillrose normally reaches 52° and falls to 26°. The record high is 77°, in 1990; the record low −10°, in 1940. The most rain on this date, 0.38 in, fell in 1993.
Normals 1991–2020 and records since 1937 at Akron Washington County Airport, 19 miles east-southeast, 520 ft higher. NOAA, through RCC-ACIS.
