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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE PORTLAND OR
942 AM PDT TUE JUN 16 2026
..ADJUSTING FLOOD LEVELS FOR THE MOLALLA RIVER NEAR CANBY
THE NATIONAL WEATHER SERVICE IN PORTLAND, OR HAS ADJUSTED THE
FLOOD WARNING LEVELS FOR THE RIVER FORECAST POINT ON THE MOLALLA
RIVER NEAR CANBY, 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 NEAR CANBY EXPERIENCED EXTENSIVE PROPERTY
DAMAGE AND CHANNEL MIGRATION. CURRENT FLOOD THRESHOLDS NO LONGER
ACCURATELY REFLECT LOCAL IMPACTS; FOR INSTANCE, THE 2025 EVENT
CAUSED WIDESPREAD FLOODING DESPITE ONLY REACHING MINOR THRESHOLD
LEVELS. BASED ON COMMUNITY OUTREACH, HISTORICAL DATA, AND
GEOSPATIAL ANALYSIS, WE ARE UPDATING THE FLOOD STAGE VALUES TO
BETTER ALIGN WITH THE AREA'S EVOLVING GEOMORPHOLOGY AND
HYDROLOGICAL CONDITIONS.
THE FOLLOWING NEW FLOOD LEVELS FOR THE MOLALLA RIVER NEAR CANBY
HAVE BEEN COORDINATED WITH THE CLACKAMAS COUNTY EMERGENCY
MANAGEMENT, THE PUBLIC, AND THE NORTHWEST RIVER FORECAST CENTER.
THE FLOOD STAGE AND CORRESPONDING DISCHARGE BASED ON THE LATEST
RATING CURVE:
CURRENT: PROPOSED:
CANO3 ACTION STAGE/DISCHARGE 20 FT/18,829 CFS 18 FT/13,285 CFS
CANO3 MINOR STAGE/DISCHARGE 23 FT/27,546 CFS 20 FT/18,829 CFS
CANO3 MODERATE STAGE/DISCH. 24 FT/30,840CFS 22.4 FT/25,880CFS
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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