The St. Henry 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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4° on Nov. 13, 2019, the coldest reading for this week of the year since 1897. Next is 6° in 1959.
St. Henry’s center stands about 960 ft above sea level. Within three miles the land runs from 910 ft to 1,010 ft, a difference of 100 ft: gently rolling country.
Under the town center the state geologic map shows Lockport Dolomite (dolostone), from the Silurian, 425 to 445 million years old.
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 63×. 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: Silurian, 425 to 445 million years old. About 12 mi of the line.
Dolostone. Age: Silurian, 422 to 445 million years old. About 9 mi of the line.
Shale, dolostone, limestone. Age: Ordovician, 445 to 487 million years old. About 3 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 St. Henry reaches the Gulf of America by way of Coldwater Creek, Beaver Creek, the Wabash, Big Bayou, the Wabash River Old Channel, the Old Channel Wabash, the Ohio and the Mississippi: about 1,580 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of St. Henry; river miles along the main stem, rounded.
St. Henry has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 19° in January. A normal year brings about 29 inches of snow; with the rain, that comes to about 40 inches of water.
On November 14 St. Henry normally reaches 51° and falls to 34°. The record high is 71°, in 1956; the record low 12°, in 1986. The most rain on this date, 2.49 in, fell in 1993.
Normals 1991–2020 and records since 1897 at Celina 3 NE, 11 miles north-northeast. NOAA, through RCC-ACIS.
