The Ticonderoga 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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Ticonderoga’s center stands about 1,470 ft above sea level. Within three miles the land runs from 740 ft to 2,000 ft, a difference of 1,260 ft: steep hill country. The highest named summit within 15 miles is Hoffman Mountain, about 3,680 ft, 14 miles west-northwest.
Under the town center the state geologic map shows Glacial and Alluvial Deposits (unconsolidated), from the Quaternary, less than 2.6 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 9×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Charnockite, gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 12 mi of the line.
Paragneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
Shale, limestone. Age: Late Ordovician, 445 to 459 million years old. About 2 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 2 mi of the line.
Marble. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 0.9 mi of the line.
Sandstone. Age: Cambrian, 487 to 497 million years old. About 0.7 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.
Ticonderoga straddles the St. Lawrence Divide. Rain on the west side runs to New York Harbor and the Atlantic Ocean; most of the rest goes to the St. Lawrence River.
From the center of town, a raindrop reaches the St. Lawrence River by way of Putnam Creek and the Richelieu: about 180 river miles. The St. Lawrence carries it on to the Atlantic. One that lands on the west side reaches New York Harbor and the Atlantic Ocean by way of Alder Creek, the Schroon and the Hudson: about 290 river miles.
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 Ticonderoga; river miles along the main stem, rounded.
