The Bloomsdale 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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86° on Nov. 14, 1999, the hottest reading for this week of the year since 1974. Next is 85° in 1989.
Bloomsdale’s center stands about 500 ft above sea level. Within three miles the land runs from 380 ft to 820 ft, a difference of 440 ft: hilly country. The highest named summit within 15 miles is Little Vine Hill, about 1,020 ft, 11 miles southwest.
Under the town center the state geologic map shows Joachim Dolomite, Dutchtown Formation (dolostone, limestone, shale), from the Middle Ordovician, 459 to 471 million years old.
The section below crosses 14 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 28×. 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: Early Ordovician, 471 to 487 million years old. About 5 mi of the line.
Limestone. Age: Middle Mississippian, 331 to 347 million years old. About 2 mi of the line.
Sandstone. Age: Cambrian, 487 to 497 million years old. About 2 mi of the line.
Dolostone, shale, siltstone. Age: Cambrian, 487 to 497 million years old. About 2 mi of the line.
Limestone. Age: Middle Mississippian, 331 to 347 million years old. About 2 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million 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. 8 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 Bloomsdale reaches the Gulf of America by way of the Mississippi: about 1,110 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Bloomsdale; river miles along the main stem, rounded.
Bloomsdale has a hot-summer humid continental climate. Summer afternoons average 89° in July; winter nights fall to about 24° in January. About 43 inches of rain fall in a normal year, with about 4 inches of snow.
On November 14 Bloomsdale normally reaches 56° and falls to 37°. The record high is 86°, in 1999; the record low 9°, in 1986. The most rain on this date, 3.40 in, fell in 1993.
Normals 1991–2020 and records since 1974 at Kaskaskia River Navigation Lock, 15 miles east, 110 ft lower. NOAA, through RCC-ACIS.
