The Lyon Mountain 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.
Chance of showers
Mostly cloudy; warmer
Mostly cloudy
Mostly sunny
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Partly cloudy
Partly cloudy
Lyon Mountain’s center stands about 2,630 ft above sea level. Within three miles the land runs from 1,540 ft to 3,660 ft, a difference of 2,120 ft: mountain country. The highest named summit within 15 miles is Lyon Mountain, about 3,840 ft, 1 miles south.
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 7×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 11 mi of the line.
Charnockite, gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 8 mi of the line.
Sandstone. Age: Cambrian, 487 to 497 million years old. About 5 mi of the line.
Metasedimentary, migmatite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 0.3 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 Lyon Mountain reaches the St. Lawrence River by way of the Great Chazy and the Richelieu: about 140 river miles. The St. Lawrence carries it on to the Atlantic.
Lake on the way: Lake Champlain.
80 miles of the trip are on the Richelieu.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lyon Mountain; river miles along the main stem, rounded.
