Geologic flood deposits at Georgetown, Washington D.C.
By Ecosystems Land Change Science Program
January 2026 (approx.)
Detailed Description
Coarse-grained sediment deposited on the marshlands of Theodore Roosevelt Island in the Potomac River during a large ice jam in 1784 CE—estimated as double the magnitude of modern flood events.
Sources/Usage
Public Domain.
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USGS Ecosystems’ Land Change Science Program: Science That Advances National Priorities
The USGS Ecosystems' Land Change Science Program provides trusted, place‑based science to strengthen wildfire resilience, support local preparedness, and protect natural and recreational resources.