The Hebgen Lake Estates 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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−25° on Nov. 12, 1911, the coldest reading for this week of the year since 1904. Next is −25° in 1955.
Hebgen Lake Estates’s center stands about 6,560 ft above sea level. Within three miles the land runs from 6,530 ft to 7,030 ft, a difference of 500 ft: hilly country. The highest named summit within 15 miles is Sage Peak, about 10,570 ft, 12 miles north-northwest.
Under the town center the state geologic map shows Glacial deposit (unconsolidated), from the Pleistocene to Holocene, less than 1.8 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 5×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Schist, gneiss. Age: Archean to Paleoproterozoic. About 5 mi of the line.
Unconsolidated. Age: Pleistocene to Holocene, less than 1.8 million years old. About 5 mi of the line.
Volcanic. Age: Pliocene to Pleistocene, 1.8 to 5.3 million years old. About 3 mi of the line.
Unconsolidated. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Rhyolite. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Age: Archean to Paleoproterozoic. About 1 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 Hebgen Lake Estates reaches the Gulf of America by way of Hebgen Lake, the Madison, the Missouri and the Mississippi: about 3,590 river miles.
Lakes on the way: Lake Oahe, Lake Sakakawea, Lake Fort Peck and Lake Sharpe.
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 Hebgen Lake Estates; river miles along the main stem, rounded.
Hebgen Lake Estates has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about 4° in January. A normal year brings about 177 inches of snow; with the rain, that comes to about 29 inches of water.
On November 14 Hebgen Lake Estates normally reaches 35° and falls to 19°. The record high is 56°, in 1953; the record low −9°, in 1909. The most rain on this date, 1.08 in, fell in 1960.
Normals 1991–2020 and records since 1904 at Hebgen Dam, 10 miles northwest. NOAA, through RCC-ACIS.
