December 20, 1866 Tsunami: Port Townsend, WA, United States
A tsunami of meteorological origin began at Port Townsend, WA, United States on December 20, 1866. Its effects were recorded at 1 place.
Where the waves reached
The source (white) and every runup with a place, colored by the water height recorded there. A ring is a runup NCEI marks doubtful.
- Under 1 m
- 1 to 3 m
- 3 to 10 m
- 10 to 30 m
- 30 m and more
- Height not recorded
The tsunami
- Date
- December 20, 1866
- Source
- Port Townsend, WA, United States
- Cause
- Meteorological
- Runups recorded
- 1
- Waters
- Ocean
- How certain
- Erroneous entry
The toll
The record gives no deaths, injuries or damage for this tsunami.
What the record says
NCEI’s account, from the sources it cites.
The marigram from Astoria shows two days of heavy storm activity. Not a tsunami.
Every runup
Nearest the source first. Heights are above sea level at the time; a tide gauge reads half the wave’s full height.
| Where | Country | Km from source | Water height, m | Inland, m | Measured by | First wave, UTC | Deaths |
|---|---|---|---|---|---|---|---|
| Port Townsend, WA, WA | United States | Eyewitness observation of water height |
More
Every tsunami in 1866The 1800sTsunamis of United StatesThis day in weather historyAlerts in force
Sources
Tsunami events and runups from NOAA’s National Centers for Environmental Information, Global Historical Hazard Database, cited as NCEI/WDS, doi:10.7289/V5PN93H7. Public domain. Read 2026-09-24. NCEI tsunami event 960.