Apr 7, 2018
During the three day period from April 6th through the 8th the northern Cascades of Eastern Washington received a period of rain amounting to 0.75 inches in Mazama, 0.89 inches in Winthrop and 0.98 inches at Holden Village. This rain coupled with snow melt saturated the ground and promoted a number of road washouts and debris flows in Okanogan County on April 7th and 8th.
Source: NOAA National Weather Service Storm Events Database (event 750771). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Okanogan County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.