The Alexandria Bay 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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Alexandria Bay’s center stands about 240 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 Honey Hill, about 520 ft, 11 miles east-southeast.
The section below crosses 8 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.
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 3 mi of the line.
Gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 1 mi of the line.
Quartzite, mica-schist. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 1 mi of the line.
Gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 1 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 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.
A raindrop that lands in Alexandria Bay reaches the St. Lawrence River by way of the Saint Lawrence: about 85 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 Alexandria Bay; river miles along the main stem, rounded.
