The Fontenelle 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. 15, 2016, the hottest reading for this week of the year since 1963. Next is 63° in 2025.
Fontenelle’s center stands about 6,490 ft above sea level. Within three miles the land runs from 6,370 ft to 6,770 ft, a difference of 400 ft: hilly country. The highest named summit within 15 miles is Eighteenmile Knoll, about 6,920 ft, 14 miles northeast.
Under the town center the state geologic map shows Green River Formation - Laney Member (oil-shale, marlstone), from the Eocene, 34 to 56 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 29×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Oil-shale, marlstone. Age: Eocene, 34 to 56 million years old. About 14 mi of the line.
Clay, silt, sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 5 mi of the line.
Gravel. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Sandstone, claystone. Age: Eocene, 34 to 56 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.
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 Fontenelle reaches the Gulf of California by way of the Green River and the Colorado: about 1,550 river miles.
Lakes on the way: Lake Mead, Lake Powell, Flaming Gorge Reservoir and Lake Mohave.
410 miles of the trip are on the Green River.
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 Fontenelle; river miles along the main stem, rounded.
Fontenelle has a cold semi-arid climate. Summer afternoons average 83° in July; winter nights fall to about 0° in January. A normal year brings about 26 inches of snow; with the rain, that comes to about 8 inches of water.
On November 14 Fontenelle normally reaches 42° and falls to 11°. The record high is 62°, in 2025; the record low −12°, in 1997. The most rain on this date, 0.18 in, fell in 1971.
Normals 1991–2020 and records since 1963 at Fontenelle Dam, here. NOAA, through RCC-ACIS.
