The Sandy River 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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Sandy River’s center stands about 2,970 ft above sea level. Within three miles the land runs from 1,470 ft to 3,800 ft, a difference of 2,330 ft: mountain country. The highest named summit within 15 miles is Sugarloaf Mountain, about 4,210 ft, 14 miles northeast.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 7×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granodiorite. Age: Devonian, 359 to 422 million years old. About 11 mi of the line.
Conglomerate. Age: Silurian, 434 to 445 million years old. About 5 mi of the line.
Shale, graywacke. Age: Ordovician, 445 to 487 million years old. About 2 mi of the line.
Sandstone, conglomerate. Age: Silurian, 434 to 445 million years old. About 2 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 1 mi of the line.
Metasandstone, slate, calc-silicate-rock. Age: Silurian, 422 to 445 million 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. 1 smaller unit 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 Sandy River reaches the Atlantic Ocean by way of the Cascade Stream, the Rapid, the Androscoggin and the Kennebec: about 240 river miles.
Lakes on the way: Lower Richardson Lake, Umbagog Lake and Rangeley Lake.
180 miles of the trip are on the Androscoggin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Sandy River; river miles along the main stem, rounded.
