The Monarch Mill 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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4.26 inches of rain fell in two days, the most for this week of the year since records began in 1893. The next wettest, 4.07 inches, fell in 2020.
Monarch Mill’s center stands about 540 ft above sea level. Within three miles the land runs from 430 ft to 660 ft, a difference of 230 ft: rolling country. The highest named summit within 15 miles is Beddington Mountain, about 780 ft, 13 miles west.
Under the town center the state geologic map shows Granite - Bald Rock pluton, from the Carboniferous to Permian, 252 to 359 million years old.
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 53×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite. Age: Carboniferous to Permian, 252 to 359 million years old. About 14 mi of the line.
Metagranite. Age: Neoproterozoic to Devonian, 359 to 1,000 million years old. About 4 mi of the line.
Metagranite, metadiorite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 3 mi of the line.
Biotite-gneiss. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 2 mi of the line.
Granite. Age: Paleozoic, 252 to 542 million years old. About 1 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 Monarch Mill reaches the Atlantic Ocean by way of Meng Creek, Big Browns Creek, Browns Creek, the Broad, the Congaree, the Santee and the South Santee: about 250 river miles.
Lake on the way: Lib Pines Lake.
70 miles of the trip are on the Santee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Monarch Mill; river miles along the main stem, rounded.
Monarch Mill has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 31° in January. About 45 inches of rain fall in a normal year, with about 3 inches of snow.
On November 14 Monarch Mill normally reaches 64° and falls to 39°. The record high is 84°, in 1931; the record low 18°, in 1920. The most rain on this date, 1.20 in, fell in 1940.
Normals 1991–2020 and records since 1893 at Santuck, 7 miles south-southeast. NOAA, through RCC-ACIS.
