The Ogdensburg 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.
Ogdensburg’s center stands about 300 ft above sea level. Within three miles the land runs from 240 ft to 360 ft, a difference of 120 ft: gently rolling country. The highest named summit within 15 miles is Mount Lona, about 490 ft, 9 miles southeast.
Under the town center the state geologic map shows Beekmantown Group (in part) (dolostone, limestone), from the Early Ordovician, 471 to 487 million years old.
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, limestone. Age: Early Ordovician, 471 to 487 million years old. About 14 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 Ogdensburg reaches the St. Lawrence River by way of the Saint Lawrence: about 50 river miles. The St. Lawrence carries it on to the Atlantic.
Lake on the way: Lake Saint Lawrence.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ogdensburg; river miles along the main stem, rounded.