The Spring Gap 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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79° on Nov. 15, 2011, the hottest reading for this week of the year since 1974. Next is 78° in 2020.
Spring Gap’s center stands about 630 ft above sea level. Within three miles the land runs from 560 ft to 1,390 ft, a difference of 830 ft: hilly country. The highest named summit within 15 miles is Dans Mountain, about 2,860 ft, 10 miles west.
The section below crosses 16 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 9×. 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. Age: Devonian, 359 to 422 million years old. About 9 mi of the line.
Shale, siltstone. Age: Devonian to Late Devonian, 374 to 422 million years old. About 4 mi of the line.
Shale, siltstone. Age: Devonian, 359 to 422 million years old. About 2 mi of the line.
Shale, sandstone. Age: Devonian, 359 to 422 million years old. About 1 mi of the line.
Claystone, shale. Age: Carboniferous, 299 to 324 million years old. About 1 mi of the line.
Shale, sandstone. Age: Devonian, 359 to 422 million years old. About 0.9 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 10 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 Spring Gap reaches Chesapeake Bay and the Atlantic Ocean by way of Brice Hollow Run, the North Branch Potomac and the Potomac: about 300 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Spring Gap; river miles along the main stem, rounded.
Spring Gap has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 23° in January. A normal year brings about 29 inches of snow; with the rain, that comes to about 39 inches of water.
On November 14 Spring Gap normally reaches 54° and falls to 34°. The record high is 71°, in 1993; the record low 13°, in 1986. The most rain on this date, 0.72 in, fell in 1997.
Normals 1991–2020 and records since 1974 at Cumberland 2, 6 miles north-northwest, 100 ft higher. NOAA, through RCC-ACIS.
