The Port Deposit 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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78° on Nov. 12, 1999, the hottest reading for this week of the year since 1936. Next is 77° in 1993.
Port Deposit’s center stands about 40 ft above sea level. Within three miles the land runs from 0 ft to 480 ft, a difference of 480 ft: hilly country. The highest named summit within 15 miles is Goat Hill, about 500 ft, 8 miles north.
Under the town center the state geologic map shows Metagabbro and Amphibolite (metagabbro, amphibolite), from the Paleozoic, 252 to 542 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 36×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Metagabbro, amphibolite. Age: Paleozoic, 252 to 542 million years old. About 5 mi of the line.
Mica-schist, quartzite. Age: Paleozoic, 252 to 542 million years old. About 3 mi of the line.
Gabbro. Age: Proterozoic to Paleozoic, 252 to 2,500 million years old. About 2 mi of the line.
Serpentinite. Age: Proterozoic to Paleozoic, 252 to 2,500 million years old. About 1 mi of the line.
Muscovite-schist. Age: Proterozoic, 542 to 2,500 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.
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 Port Deposit reaches Chesapeake Bay and the Atlantic Ocean by way of the Susquehanna: about 5 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Port Deposit; river miles along the main stem, rounded.
Port Deposit has a humid subtropical climate. Summer afternoons average 88° in July; winter nights fall to about 25° in January. About 48 inches of rain fall in a normal year.
On November 14 Port Deposit normally reaches 56° and falls to 37°. The record high is 75°, in 1955; the record low 22°, in 2019. The most rain on this date, 1.02 in, fell in 1957.
Normals 1991–2020 and records since 1936 at Conowingo Dam, 5 miles northwest. NOAA, through RCC-ACIS.
