The Saverton 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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3° on Nov. 17, 1959, the coldest reading for this week of the year since 1948. Next is 10° in 1986.
Saverton’s center stands about 490 ft above sea level. Within three miles the land runs from 450 ft to 810 ft, a difference of 360 ft: rolling country. The highest named summit within 15 miles is Pickerton Hill, about 840 ft, 8 miles south-southeast.
Under the town center the state geologic map shows Leemon Formation, Maquoketa Group, Cape Limestone, Kimmswick Limestone, Noix-Cyrene Limestone, Maquoketa Shale, from the Middle Ordovician to Late Ordovician, 445 to 471 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 53×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, limestone. Age: Late Ordovician, 445 to 454 million years old. About 6 mi of the line.
Limestone, siltstone. Age: Carboniferous, 324 to 359 million years old. About 5 mi of the line.
Shale. Age: Middle Devonian to Late Devonian, 359 to 388 million years old. About 4 mi of the line.
Limestone, sandstone. Age: Early Devonian to Late Devonian, 359 to 422 million years old. About 4 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 3 mi of the line.
Limestone. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 smaller units 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 Saverton reaches the Gulf of America by way of the Mississippi: about 1,270 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Saverton; river miles along the main stem, rounded.
Saverton has a hot-summer humid continental climate. Summer afternoons average 89° in July; winter nights fall to about 21° in January. About 38 inches of rain fall in a normal year.
On November 14 Saverton normally reaches 55° and falls to 36°. The record high is 81°, in 1999; the record low 10°, in 1986. The most rain on this date, 0.55 in, fell in 1985.
Normals 1991–2020 and records since 1948 at Saverton Lock And Dam 22, here. NOAA, through RCC-ACIS.
