The Clam Lake 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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Clam Lake’s center stands about 1,440 ft above sea level. Within three miles the land runs from 1,410 ft to 1,550 ft, a difference of 140 ft: gently rolling country.
Under the town center the state geologic map shows Migmatitic gneiss and amphibolite (Late to Early Archean) (gneiss, amphibolite), from the Paleoarchean, 3.2 to 3.6 billion years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 45×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gneiss, amphibolite. Age: Paleoarchean, 3.2 to 3.6 billion years old. About 14 mi of the line.
Gneiss, amphibolite. Age: Neoarchean, 2.5 to 2.8 billion years old. About 8 mi of the line.
Granitic. Age: Mesoproterozoic, 1.1 to 1.1 billion years old. About 2 mi of the line.
Basalt. Age: Mesoproterozoic, 1.1 to 1.1 billion years old. About 0.9 mi of the line.
Gabbro. Age: Mesoproterozoic, 1.1 to 1.1 billion years old. About 0.4 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 Clam Lake reaches the Gulf of America by way of the West Fork Chippewa, the Chippewa and the Mississippi: about 1,950 river miles.
Lakes on the way: Moonshine Lake, Lake Wissota and Holcombe Flowage.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Clam Lake; river miles along the main stem, rounded.
