The Arna 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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Showers likely
Arna’s center stands about 1,020 ft above sea level. Within three miles the land runs from 930 ft to 1,130 ft, a difference of 200 ft: gently rolling country.
Under the town center the state geologic map shows Minong volcanic sequence, from the Mesoproterozoic, 1 to 1.2 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 48×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Volcanic. Age: Mesoproterozoic, 1 to 1.2 billion years old. About 9 mi of the line.
Mafic-volcanic. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 9 mi of the line.
Basalt. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.
Sandstone, conglomerate. Age: Mesoproterozoic, 1 to 1.6 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 Arna reaches the Gulf of America by way of Albrechts Creek, the Lower Tamarack, the Saint Croix and the Mississippi: about 1,920 river miles.
Lakes on the way: Lake Pepin and Lake Mallalieu 175.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Arna; river miles along the main stem, rounded.
