The St. Ann Highlands 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.
Partly cloudy
Mostly sunny; warmer
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Chance of showers
65° on Nov. 14, 1999, the hottest reading for this week of the year since 1989. Next is 62° in 2016.
St. Ann Highlands’s center stands about 8,260 ft above sea level. Within three miles the land runs from 7,430 ft to 8,900 ft, a difference of 1,470 ft: steep hill country. The highest named summit within 15 miles is North Arapaho Peak, about 13,480 ft, 11 miles west-northwest.
Under the town center the state geologic map shows Granitic rocks of 1700-m.y. age group (granite), from the Paleoproterozoic, 1.6 to 2.5 billion years old.
The section below crosses 10 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 16 mi of the line.
Biotite-gneiss, schist, migmatite. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 2 mi of the line.
Granitic, dioritic. Age: Late Cretaceous to Middle Eocene, 40 to 72 million years old. About 2 mi of the line.
Shale. Age: Late Cretaceous, 66 to 100 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.
Gravel, unconsolidated. Age: Pleistocene, 0.2 to 1.6 million years old. About 0.5 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 4 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 St. Ann Highlands reaches the Gulf of America by way of North Boulder Creek, Boulder Creek, Saint Vrain Creek, the South Platte, the Platte, the Missouri and the Mississippi: about 2,400 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 St. Ann Highlands; river miles along the main stem, rounded.
St. Ann Highlands 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 St. Ann Highlands 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, 19 miles west, 300 ft higher. NOAA, through RCC-ACIS.
