The Riverdale Park 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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3.21 inches of rain fell in two days, the most for this week of the year since records began in 1948. The next wettest, 2.60 inches, fell in 2004.
Riverdale Park’s center stands about 50 ft above sea level. Within three miles the land runs from 10 ft to 220 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Mount Daniel, about 480 ft, 15 miles west-southwest.
Under the town center the state geologic map shows Lowland Deposits (fine-detrital, coarse-detrital), from the Pleistocene, less than 2.6 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 39×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand. Age: Cretaceous, 66 to 145 million years old. About 8 mi of the line.
Biotite-schist. Age: Proterozoic, 542 to 2,500 million years old. About 5 mi of the line.
Sand, clay. Age: Miocene, 5.3 to 23 million years old. About 4 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Muscovite-gneiss. Age: Proterozoic, 542 to 2,500 million years old. About 2 mi of the line.
Gravel, sand. Age: Pleistocene, less than 2.6 million years old. About 1 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 Riverdale Park reaches Chesapeake Bay and the Atlantic Ocean by way of the Northeast Branch Anacostia, the Anacostia and the Potomac: about 120 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Riverdale Park; river miles along the main stem, rounded.
Riverdale Park has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 28° in January. A normal year brings about 10 inches of snow; with the rain, that comes to about 46 inches of water.
On November 14 Riverdale Park normally reaches 59° and falls to 39°. The record high is 77°, in 1955; the record low 17°, in 1986. The most rain on this date, 1.62 in, fell in 1972.
Normals 1991–2020 and records since 1948 at National Arboretum Dc, 4 miles south-southwest. NOAA, through RCC-ACIS.
