The Hammondsport 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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Hammondsport’s center stands about 760 ft above sea level. Within three miles the land runs from 710 ft to 1,910 ft, a difference of 1,200 ft: steep hill country. The highest named summit within 15 miles is West Hill, about 2,140 ft, 11 miles northwest.
Under the town center the state geologic map shows Beers Hill, Dunn Hill, Millport, and Moreland Shales; Grimes Siltstone, from the Late Devonian, 359 to 384 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 14×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, siltstone. Age: Late Devonian, 359 to 384 million years old. About 11 mi of the line.
Shale. Age: Late Devonian, 359 to 384 million years old. About 8 mi of the line.
Shale. Age: Late Devonian, 359 to 384 million years old. About 5 mi of the line.
Shale, siltstone. Age: Late Devonian, 359 to 384 million years old. About 0.6 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 Hammondsport reaches Lake Ontario by way of Glen Brook, the Keuka Lake Outlet, the Seneca and the Oswego: about 130 river miles. From the lake it goes down the St. Lawrence to the Atlantic.
Lakes on the way: Seneca Lake, Cayuga Lake and West Branch Keuka Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hammondsport; river miles along the main stem, rounded.
