The Fall 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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Fall Lake’s center stands about 1,420 ft above sea level. Within three miles the land runs from 1,330 ft to 1,600 ft, a difference of 270 ft: rolling country. The highest named summit within 15 miles is Disappointment Mountain, about 1,830 ft, 4 miles east.
Under the town center the state geologic map shows Syenite, monzodiorite, granodiorite, and diorite, from the Neoarchean, 2.5 to 2.8 billion years old.
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 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.
Alkalic-volcanic. Age: Neoarchean, 2.5 to 2.8 billion years old. About 9 mi of the line.
Anorthosite. Age: Mesoproterozoic, 1 to 1.2 billion years old. About 4 mi of the line.
Conglomerate-sandstone, siltstone, graywacke. Age: Neoarchean, 2.5 to 2.8 billion years old. About 4 mi of the line.
Syenite, monzodiorite, granodiorite. Age: Neoarchean, 2.5 to 2.8 billion years old. About 3 mi of the line.
Age: Mesoproterozoic, 1 to 1.2 billion years old. About 3 mi of the line.
Metabasalt, greenstone. Age: Neoarchean, 2.5 to 2.8 billion years old. About 2 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 Fall Lake reaches Hudson Bay by way of Snowbank Lake, Basswood Lake, the Bottle, the Loon, the Rainy, the Winnipeg and the Nelson: about 1,100 river miles. Past the border it runs north through Canada to Hudson Bay.
Lakes on the way: Lake of the Woods, Rainy Lake, Basswood Lake and Snowbank Lake.
400 miles of the trip are on the Nelson.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Fall Lake; river miles along the main stem, rounded.
