The Thousand Island Park 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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Thousand Island Park’s center stands about 280 ft above sea level. Within three miles the land runs from 240 ft to 370 ft, a difference of 130 ft: gently rolling country. The highest named summit within 15 miles is Fox Hill, about 470 ft, 6 miles south.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Cambrian to Early Ordovician, 471 to 542 million years old. About 8 mi of the line.
Sandstone. Age: Cambrian, 487 to 497 million years old. About 4 mi of the line.
Gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. 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.
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 Thousand Island Park reaches the St. Lawrence River by way of the Saint Lawrence: about 90 river miles. The St. Lawrence carries it on to the Atlantic.
Lake on the way: Lake Saint Lawrence.
55 miles of the trip are on the Saint Lawrence.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Thousand Island Park; river miles along the main stem, rounded.
