The Roxborough Park 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. 13, 2014, the coldest reading for this week of the year since 1918. Next is −9° in 1955.
Roxborough Park’s center stands about 5,750 ft above sea level. Within three miles the land runs from 5,460 ft to 6,920 ft, a difference of 1,460 ft: steep hill country. The highest named summit within 15 miles is Devils Head, about 9,680 ft, 15 miles south.
The section below crosses 11 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.
Biotite-gneiss, schist, migmatite. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 9 mi of the line.
Arkose, conglomerate, shale. Age: Paleocene to Eocene, 34 to 66 million years old. About 7 mi of the line.
Gravel, unconsolidated. Age: Pleistocene, 0.2 to 1.6 million years old. About 2 mi of the line.
Alkali-feldspar-granite, granite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
Siltstone, sandstone, conglomerate. Age: Carboniferous to Early Triassic, 247 to 324 million years old. About 1 mi of the line.
Gravel, unconsolidated. Age: Pleistocene, less than 0.5 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 5 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 Roxborough Park reaches the Gulf of America by way of the South Platte, the Platte, the Missouri and the Mississippi: about 2,420 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 Roxborough Park; river miles along the main stem, rounded.
Roxborough Park has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 17° in January. A normal year brings about 62 inches of snow; with the rain, that comes to about 18 inches of water.
On November 14 Roxborough Park normally reaches 55° and falls to 26°. The record high is 79°, in 1933; the record low −6°, in 2014. The most rain on this date, 0.78 in, fell in 1994.
Normals 1991–2020 and records since 1918 at Kassler, here, 250 ft lower. NOAA, through RCC-ACIS.
