The Granby 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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59° on Nov. 15, 2016, the hottest reading for this week of the year since 1948. Next is 58° in 1999.
Granby’s center stands about 7,970 ft above sea level. Within three miles the land runs from 7,830 ft to 8,880 ft, a difference of 1,050 ft: steep hill country. The highest named summit within 15 miles is Mount Jasper, about 12,850 ft, 15 miles east-southeast.
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 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.
Arkose, conglomerate, shale. Age: Paleocene to Eocene, 34 to 66 million years old. About 7 mi of the line.
Granite. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 6 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Unconsolidated. Age: Pleistocene, less than 0.5 million years old. About 2 mi of the line.
Clastic. Age: Mesozoic, 66 to 252 million years old. About 2 mi of the line.
Gravel, unconsolidated. Age: Pleistocene, less than 0.5 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. 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 Granby reaches the Gulf of California by way of Tenmile Creek, the Fraser and the Colorado: about 1,380 river miles.
Lakes on the way: Lake Mead, Lake Powell, Lake Mohave and Lake Havasu.
410 miles of the trip are on the Colorado.
Seldom reaches the sea. Dams and canals now take nearly all of the Colorado before its old delta in Mexico.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Granby; river miles along the main stem, rounded.
Granby has a warm-summer humid continental climate. Summer afternoons average 75° in July; winter nights fall to about 2° in January. About 14 inches of rain fall in a normal year.
On November 14 Granby normally reaches 40° and falls to 18°. The record high is 58°, in 1999; the record low −6°, in 2000. The most rain on this date, 0.34 in, fell in 1980.
Normals 1991–2020 and records since 1948 at Grand Lake 6 SSW, 8 miles north-northeast, 320 ft higher. NOAA, through RCC-ACIS.
