The Spragueville 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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74° on Nov. 14, 1999, the hottest reading for this week of the year since 1937. Next is 73° in 2022.
Spragueville’s center stands about 640 ft above sea level. Within three miles the land runs from 610 ft to 810 ft, a difference of 200 ft: rolling country. The highest named summit within 15 miles is Lost Mound, about 840 ft, 12 miles northeast.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 56×. 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: Late Ordovician to Silurian, 434 to 447 million years old. About 12 mi of the line.
Dolostone. Age: Silurian, 431 to 440 million years old. About 7 mi of the line.
Shale, dolostone. Age: Late Ordovician, 447 to 454 million years old. About 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 Spragueville reaches the Gulf of America by way of the Maquoketa and the Mississippi: about 1,530 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Spragueville; river miles along the main stem, rounded.
Spragueville has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 12° in January. A normal year brings about 32 inches of snow; with the rain, that comes to about 38 inches of water.
On November 14 Spragueville normally reaches 48° and falls to 30°. The record high is 74°, in 1999; the record low 3°, in 1986. The most rain on this date, 1.11 in, fell in 2001.
Normals 1991–2020 and records since 1937 at Bellevue L/D 12, 13 miles north. NOAA, through RCC-ACIS.
