CO-OPS recently determined that water level data from Skamokawa (9440569) contained an error due to the conversion of pressure to water level in our database. This error resulted in water level measurements several centimeters higher than actual. Impacted water level products from March 27, 2002 to August 4, 2021 have now been corrected, including 6-minute water level data, hourly heights, highs/lows, monthly means, and tidal datums. Any data products downloaded from this time will need to be re-downloaded. Water level products from August 4, 2021 to present, including real-time data, were not impacted. If you have any questions, please send an email to Tide.Predictions@noaa.gov
and we will get back to you as soon as possible.