The Hillview 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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3.95 inches of rain fell in two days, the most for this week of the year since records began in 1887. The next wettest, 3.65 inches, fell in 2009.
Hillview’s center stands about 460 ft above sea level. Within three miles the land runs from 420 ft to 660 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Calvert Hill, about 740 ft, 14 miles northwest.
Under the town center the state geologic map shows Meppen Limestone, Fern Glen Formation, and Burlington-Keokuk Limestone, from the Early Mississippian to Middle Mississippian, 331 to 359 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 57×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone. Age: Early Mississippian to Middle Mississippian, 331 to 359 million years old. About 6 mi of the line.
Shale, sandstone, coal. Age: Middle Pennsylvanian to Late Pennsylvanian, 304 to 315 million years old. About 6 mi of the line.
Limestone, shale. Age: Early Mississippian, 347 to 359 million years old. About 4 mi of the line.
Dolostone, limestone. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Shale. Age: Middle Devonian to Late Devonian, 359 to 388 million years old. About 3 mi of the line.
Shale, sandstone. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 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. 1 smaller unit 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 Hillview reaches the Gulf of America by way of Hurricane Creek, the Illinois and the Mississippi: about 1,240 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hillview; river miles along the main stem, rounded.
Hillview has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 18° in January. A normal year brings about 18 inches of snow; with the rain, that comes to about 40 inches of water.
On November 14 Hillview normally reaches 53° and falls to 33°. The record high is 80°, in 1931; the record low 7°, in 1986. The most rain on this date, 1.40 in, fell in 1913.
Normals 1991–2020 and records since 1887 at White Hall 1 E, 9 miles east, 120 ft higher. NOAA, through RCC-ACIS.
