The Indian Mountain Lake 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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0° on Nov. 17, 1933, the coldest reading for this week of the year since 1901. Next is 2° in 1908.
Indian Mountain Lake’s center stands about 1,840 ft above sea level. Within three miles the land runs from 1,090 ft to 2,020 ft, a difference of 930 ft: steep hill country. The highest named summit within 15 miles is Pimple Hill, about 2,220 ft, 2 miles north.
Under the town center the state geologic map shows Duncannon Member of Catskill Formation (sandstone, siltstone), from the Late Devonian, 359 to 384 million years old.
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 12×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, siltstone. Age: Late Devonian, 359 to 384 million years old. About 9 mi of the line.
Sandstone, siltstone, mudstone. Age: Late Devonian, 359 to 384 million years old. About 5 mi of the line.
Conglomerate-sandstone, clastic. Age: Late Devonian, 359 to 384 million years old. About 5 mi of the line.
Sandstone, siltstone, mudstone. Age: Late Devonian, 359 to 384 million years old. About 2 mi of the line.
Shale, siltstone. Age: Early Devonian to Middle Devonian, 384 to 422 million years old. About 2 mi of the line.
Black-shale. Age: Early Devonian to Middle Devonian, 384 to 422 million years old. About 0.6 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 Indian Mountain Lake reaches Delaware Bay and the Atlantic Ocean by way of Mud Run, the Lehigh and the Delaware: about 230 river miles.
150 miles of the trip are on the Delaware.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Indian Mountain Lake; river miles along the main stem, rounded.
Indian Mountain Lake has a warm-summer humid continental climate. Summer afternoons average 78° in July; winter nights fall to about 15° in January. About 50 inches of rain fall in a normal year.
On November 14 Indian Mountain Lake normally reaches 46° and falls to 30°. The record high is 65°, in 1955; the record low 5°, in 1905. The most rain on this date, 1.85 in, fell in 1949.
Normals 1991–2020 and records since 1901 from the Mount Pocono Area threaded record (Pocono Mountains Municipal Airport, 12 miles northeast). NOAA, through RCC-ACIS.
