The Gallatin Gateway 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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−15° on Nov. 13, 2014, the coldest reading for this week of the year since 1966. Next is −14° in 1986.
Gallatin Gateway’s center stands about 4,980 ft above sea level. Within three miles the land runs from 4,820 ft to 5,530 ft, a difference of 710 ft: hilly country. The highest named summit within 15 miles is Mount Blackmore, about 10,080 ft, 14 miles southeast.
Under the town center the state geologic map shows Gravel, from the Pleistocene to Holocene, less than 1.8 million 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 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Conglomerate, sandstone, siltstone. Age: Early Miocene to Pliocene, 2.6 to 20 million years old. About 11 mi of the line.
Andesite, dacite. Age: Early Eocene, 48 to 56 million years old. About 3 mi of the line.
Age: Pleistocene to Holocene, less than 1.8 million years old. About 3 mi of the line.
Shale, limestone, sandstone. Age: Middle Cambrian to Cambrian, 487 to 521 million years old. About 3 mi of the line.
Gravel, sand, silt. Age: Pleistocene to Holocene, less than 1.8 million years old. About 1 mi of the line.
Gneiss. Age: Archean. 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. 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 Gallatin Gateway reaches the Gulf of America by way of the Gallatin, the Missouri and the Mississippi: about 3,510 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 Gallatin Gateway; river miles along the main stem, rounded.
Gallatin Gateway has a warm-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 15° in January. About 16 inches of rain fall in a normal year.
On November 14 Gallatin Gateway normally reaches 43° and falls to 23°. The record high is 67°, in 2025; the record low −7°, in 1978. The most rain on this date, 0.78 in, fell in 1996.
Normals 1991–2020 and records since 1966 at Bozeman 6 W Experiment Farm, 6 miles north-northeast, 200 ft lower. NOAA, through RCC-ACIS.
