The Lake Andrew 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.
Partly cloudy
Mostly sunny; warmer
Mostly sunny
Partly cloudy
Mostly cloudy
Partly cloudy
Showers likely
Lake Andrew’s center stands about 1,170 ft above sea level. Within three miles the land runs from 1,110 ft to 1,250 ft, a difference of 140 ft: gently rolling country. The highest named summit within 15 miles is Mount Tom, about 1,370 ft, 4 miles north-northeast.
Under the town center the state geologic map shows Leucogranite (leucocratic-granitic), from the Neoarchean, 2.5 to 2.8 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 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.
Orthogneiss, migmatite. Age: Paleoarchean to Mesoarchean, 2.8 to 3.6 billion years old. About 10 mi of the line.
Leucocratic-granitic. Age: Neoarchean, 2.5 to 2.8 billion years old. About 9 mi of the line.
Gabbroic, dioritic. Age: Archean to Paleoproterozoic. About 3 mi of the line.
Volcanic, sedimentary, hypabyssal. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 2 mi of the line.
Gabbro, pyroxenite, diorite. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 0.3 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 Lake Andrew reaches the Gulf of America by way of Shakopee Creek, the Chippewa, the Minnesota and the Mississippi: about 2,180 river miles.
Lake on the way: Lake Pepin.
1,750 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lake Andrew; river miles along the main stem, rounded.
