Event narrative (NOAA)
The USGS River Gage on the Okanogan River at Tonasket recorded a rise above the Flood Stage of 15.0 feet at 4:45 AM PST on May 5th. The river continued to rise, passing through the Moderate Flood Stage of 17.0 Feet at 11:45 PM on May 7th and through the Major Flood Stage of 18.0 feet at 9:15 AM on May 9th. The river crested twice, the first and highest crest of 19.7 feet at 4:30 PM PST on May 11th and the second crest of 19.3 feet at 10:30 AM on May 18th. The river then receded, passing below Major Flood Stage at 9:30 PM on May 20th and below the Moderate Flood Stage at noon PST on May 22nd. The river continued to slowly recede finally passing below the Flood Stage at 2:30 AM on May 27th.
Other notable flood events in Washington
Source: NOAA/NCEI Storm Events Database. Deaths and injuries are those NOAA classifies as direct. Damage is the reporting office's estimate at the time and is not inflation-adjusted. This is a catalogue record, not a forecast.