The Marengo 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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77° on Nov. 11, 2020, the hottest reading for this week of the year since 1950. Next is 76° in 1994.
Marengo’s center stands about 1,150 ft above sea level. Within three miles the land runs from 1,020 ft to 1,270 ft, a difference of 250 ft: rolling country. The highest named summit within 15 miles is Hulse Hill, about 1,410 ft, 5 miles east.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 38×. 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, siltstone, sandstone. Age: Devonian to Carboniferous, 324 to 422 million years old. About 8 mi of the line.
Shale, black-shale. Age: Devonian, 359 to 422 million years old. About 8 mi of the line.
Sandstone, shale. Age: Devonian, 359 to 422 million years old. About 4 mi of the line.
Black-shale. Age: Carboniferous, 324 to 359 million years old. About 3 mi of the line.
Shale. Age: Devonian, 359 to 422 million years old. About 0.7 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 Marengo reaches the Gulf of America by way of Bunker Run, Alum Creek, Big Walnut Creek, the Scioto, the Ohio and the Mississippi: about 1,770 river miles.
Lake on the way: Williams Lake.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Marengo; river miles along the main stem, rounded.
Marengo has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 17° in January. About 44 inches of rain fall in a normal year.
On November 14 Marengo normally reaches 51° and falls to 32°. The record high is 71°, in 1989; the record low 4°, in 2019. The most rain on this date, 1.20 in, fell in 1972.
Normals 1991–2020 and records since 1950 at Centerburg 2 SE, 11 miles southeast. NOAA, through RCC-ACIS.
