The Rollinsville 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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65° on Nov. 14, 1999, the hottest reading for this week of the year since 1989. Next is 62° in 2016.
Rollinsville’s center stands about 8,470 ft above sea level. Within three miles the land runs from 8,180 ft to 9,780 ft, a difference of 1,600 ft: steep hill country. The highest named summit within 15 miles is North Arapaho Peak, about 13,480 ft, 11 miles northwest.
Under the town center the state geologic map shows Biotitic gneiss, schist, and migmatite (biotite-gneiss, schist, migmatite), from the Paleoproterozoic, 1.6 to 2.5 billion years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 3×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 11 mi of the line.
Biotite-gneiss, schist, migmatite. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 9 mi of the line.
Gneiss. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 2 mi of the line.
Unconsolidated. Age: Pleistocene, less than 0.5 million years old. About 1 mi of the line.
Siltstone, sandstone, conglomerate. Age: Carboniferous to Early Triassic, 247 to 324 million years old. About 0.7 mi of the line.
Granitic, dioritic. Age: Late Cretaceous to Middle Eocene, 40 to 72 million years old. About 0.6 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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 Rollinsville reaches the Gulf of America by way of South Boulder Creek, Boulder Creek, Saint Vrain Creek, the South Platte, the Platte, the Missouri and the Mississippi: about 2,410 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 Rollinsville; river miles along the main stem, rounded.
Rollinsville has a subarctic climate. Summer afternoons average 77° in July; winter nights fall to about −1° in January. A normal year brings about 143 inches of snow; with the rain, that comes to about 20 inches of water.
On November 14 Rollinsville normally reaches 42° and falls to 10°. The record high is 65°, in 1999; the record low −21°, in 2000. The most rain on this date, 0.30 in, fell in 2006.
Normals 1991–2020 and records since 1989 at Fraser, 17 miles west. NOAA, through RCC-ACIS.
