The South Harbor 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.
Mostly sunny
Mostly sunny; warmer
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Partly cloudy
Chance of showers
Partly cloudy
Showers likely
South Harbor’s center stands about 1,280 ft above sea level. Within three miles the land runs from 1,250 ft to 1,320 ft, a difference of 70 ft: gently rolling country.
The section below crosses 6 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.
Granodiorite, granite. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 15 mi of the line.
Tonalite, diorite. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 3 mi of the line.
Age: Paleoproterozoic, 1.8 to 2 billion years old. About 2 mi of the line.
Schist, slate. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 2 mi of the line.
Orthogneiss. Age: Neoarchean, 2.5 to 2.8 billion years old. About 1 mi of the line.
Sandstone, marble, mica-schist. Age: Paleoproterozoic, 1.8 to 2 billion years old. About 0.5 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 South Harbor reaches the Gulf of America by way of Mille Lacs Lake, the Rum and the Mississippi: about 2,010 river miles.
Lakes on the way: Mille Lacs Lake and Lake Pepin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of South Harbor; river miles along the main stem, rounded.
