The Ashippun 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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75° on Nov. 11, 2022, the hottest reading for this week of the year since 1893. Next is 71° in 1971.
Ashippun’s center stands about 920 ft above sea level. Within three miles the land runs from 840 ft to 1,040 ft, a difference of 200 ft: rolling country. The highest named summit within 15 miles is Holy Hill, about 1,350 ft, 10 miles east.
Under the town center the state geologic map shows Maquoketa Formation (shale, dolostone), from the Ordovician, 445 to 487 million 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 50×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Ordovician, 445 to 487 million years old. About 11 mi of the line.
Shale, dolostone. Age: Ordovician, 445 to 487 million years old. About 10 mi of the line.
Dolostone. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Sandstone. Age: Ordovician, 445 to 487 million years old. About 0.5 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 Ashippun reaches the Gulf of America by way of Davy Creek, the Rock River and the Mississippi: about 1,730 river miles.
Lake on the way: Lake Koshkonong.
1,450 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ashippun; river miles along the main stem, rounded.
Ashippun has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 11° in January. A normal year brings about 40 inches of snow; with the rain, that comes to about 37 inches of water.
On November 14 Ashippun normally reaches 47° and falls to 29°. The record high is 69°, in 1999; the record low 9°, in 1995. The most rain on this date, 1.00 in, fell in 1957.
Normals 1991–2020 and records since 1893 at Oconomowoc Wwtp, 8 miles south. NOAA, through RCC-ACIS.
