Jan 19, 2012
With a cold air mass in place over the Pacific Northwest, two strong and very moist Pacific weather systems brought snow to the area with snow levels down to the valley floor. This snow transitioned to rain from south to north across the area, with widespread heavy rains combining with melting snow to bring many rivers above flood stage and a few rivers above major flood stage.
Source: NOAA National Weather Service Storm Events Database (event 356984). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Clackamas County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.