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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE PORTLAND OR
919 AM PDT TUE JUN 16 2026
..ESTABLISHING FLOOD LEVELS FOR THE MOLALLA RIVER NEAR WILHOIT
THE NATIONAL WEATHER SERVICE IN PORTLAND, OR HAS ESTABLISHED FLOOD
WARNING LEVELS ON MOLALLA RIVER NEAR WILHOIT, EFFECTIVE JUNE 24,
2026. THE FLOOD WARNING LEVEL, OR FLOOD STAGE, IS THE RIVER LEVEL
AT WHICH A FLOOD WARNING IS ISSUED BY THE NATIONAL WEATHER
SERVICE. FOLLOWING A SIGNIFICANT ATMOSPHERIC RIVER EVENT IN
DECEMBER 2025, THE MOLALLA RIVER EXPERIENCED EXTENSIVE FLOODING.
THE MOLALLA RIVER NEAR WILHOIT DOES NOT HAVE THRESHOLDS
ESTABLISHED DESPITE SEEING IMPACTS TO PROPERTIES AND EVACUATIONS
OF COMMUNITIES NEAR MOLALLA IN 2025.AT THE NEW THRESHOLDS, MINOR
REPRESENTS POTENTIAL FLOODING IN LOW LYING AREAS OF MOLALLA,
MODERATE REPRESENTS THE POTENTIAL DAMAGE TO PROPERTIES, AND MAJOR
FLOOD THRESHOLD REPRESENTS LEVELS WHERE EVACUATIONS COULD START
BASED ON PAST EVENTS IN SHADY DELL AND MOLALLA. THE FOLLOWING NEW
FLOOD LEVELS FOR THE MOLALLA RIVER NEAR WILHOIT HAVE BEEN
COORDINATED WITH THE CLACKAMAS COUNTY EMERGENCY MANAGEMENT, THE
PUBLIC DURING A SERIES OF THREE COMMUNITY MEETINGS, AND THE
NORTHWEST RIVER FORECAST CENTER. THE FLOOD STAGE AND CORRESPONDING
DISCHARGE BASED ON THE LATEST RATING CURVE:
PROPOSED:
MOWO3 ACTION STAGE / DISCHARGE 7.5 FT / 10,000 CFS
MOWO3 MINOR FLOOD STAGE / DISCHARGE 8 FT / 15,000 CFS
MOWO3 ACTION STAGE / DISCHARGE 9 FT / 21,000 CFS
MOWO3 MINOR FLOOD STAGE / DISCHARGE 10 FT / 34,000 CFS
IF YOU WOULD LIKE MORE INFORMATION ABOUT THE NATIONAL WEATHER
SERVICE HYDROLOGIC SERVICES IN THE PORTLAND AREA, PLEASE CONTACT
LEAH POPE, SENIOR SERVICE HYDROLOGIST OR TREENA JENSEN, WARNING
COORDINATION METEOROLOGIST AT NWS.PORTLAND@NOAA.GOV.
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