The Aldrich 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
Mostly sunny
Mostly cloudy
Chance of showers
Partly cloudy
Showers likely
Aldrich’s center stands about 1,330 ft above sea level. Within three miles the land runs from 1,300 ft to 1,370 ft, a difference of 70 ft: gently rolling country. The highest named summit within 15 miles is Mount Nebo, about 1,540 ft, 8 miles west.
Under the town center the state geologic map shows Schist of sedimentary protolith, from the Neoarchean, 2.5 to 2.8 billion years old.
The section below crosses 4 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.
Schist. Age: Neoarchean, 2.5 to 2.8 billion years old. About 11 mi of the line.
Metabasalt, greenstone. Age: Neoarchean, 2.5 to 2.8 billion years old. About 9 mi of the line.
Granitic. Age: Archean to Paleoproterozoic. About 2 mi of the line.
Gabbro, peridotite, pyroxenite. 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.
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 Aldrich reaches the Gulf of America by way of the Redeye, the Crow Wing and the Mississippi: about 2,020 river miles.
Lake on the way: Lake Pepin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Aldrich; river miles along the main stem, rounded.
