The Susquehanna Trails 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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Partly cloudy; warmer
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20° on Nov. 12, 2017, the coldest reading for this week of the year since 1948. Next is 21° in 2023.
Susquehanna Trails’s center stands about 450 ft above sea level. Within three miles the land runs from 280 ft to 660 ft, a difference of 380 ft: rolling country. The highest named summit within 15 miles is Turkey Hill, about 710 ft, 14 miles north-northwest.
Under the town center the state geologic map shows Octoraro Formation (schist, phyllite), from the Paleozoic, 252 to 542 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 24×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Schist, phyllite. Age: Paleozoic, 252 to 542 million years old. About 15 mi of the line.
Metagraywacke, muscovite-schist. Age: Proterozoic, 542 to 2,500 million years old. About 3 mi of the line.
Biotite-schist. Age: Proterozoic, 542 to 2,500 million years old. About 3 mi of the line.
Muscovite-schist. Age: Proterozoic, 542 to 2,500 million years old. About 2 mi of the line.
Muscovite-gneiss. Age: Proterozoic, 542 to 2,500 million years old. About 0.9 mi of the line.
Serpentinite. Age: Proterozoic to Paleozoic, 252 to 2,500 million years old. About 0.5 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 Susquehanna Trails reaches Chesapeake Bay and the Atlantic Ocean by way of Fishing Creek, Muddy Creek and the Susquehanna: about 30 river miles.
Lake on the way: Lake Aldred.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Susquehanna Trails; river miles along the main stem, rounded.
Susquehanna Trails has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 25° in January. A normal year brings about 21 inches of snow; with the rain, that comes to about 46 inches of water.
Normals 1991–2020 and records since 1948 at Safe Harbor Dam, 12 miles north, 260 ft lower. NOAA, through RCC-ACIS.
