The Crystal Springs 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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15° on Nov. 12, 1991, the coldest reading for this week of the year since 1950. Next is 16° in 2019.
Crystal Springs’s center stands about 680 ft above sea level. Within three miles the land runs from 570 ft to 1,180 ft, a difference of 610 ft: hilly country. The highest named summit within 15 miles is Mazarn Mountain, about 1,680 ft, 14 miles west-southwest.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 27×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Black-shale, sandstone, siltstone. Age: Carboniferous, 324 to 359 million years old. About 9 mi of the line.
Black-shale. Age: Middle Ordovician, 459 to 471 million years old. About 5 mi of the line.
Sandstone. Age: Early Ordovician, 471 to 487 million years old. About 3 mi of the line.
Black-shale. Age: Early Ordovician, 471 to 487 million years old. About 2 mi of the line.
Shale, sandstone. Age: Early Ordovician to Middle Ordovician, 459 to 487 million years old. About 2 mi of the line.
Chert, shale. Age: Middle Ordovician to Late Ordovician, 445 to 471 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. 2 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 Crystal Springs reaches the Gulf of America by way of the Ouachita, the Black River, the Red River, the Atchafalaya and the Lower Atchafalaya: about 650 river miles.
430 miles of the trip are on the Ouachita.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Crystal Springs; river miles along the main stem, rounded.
Crystal Springs has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 29° in January. About 58 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Crystal Springs normally reaches 62° and falls to 39°. The record high is 81°, in 1999; the record low 16°, in 2019. The most rain on this date, 2.70 in, fell in 1958.
Normals 1991–2020 and records since 1950 at Blakely Mountain Dam, 9 miles east-northeast, 250 ft lower. NOAA, through RCC-ACIS.
