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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE PORTLAND OR
140 PM PDT TUE OCT 02 2026
SUBJECT:ESTABLISHING FLOOD LEVELS FOR THE SANDY RIVER AT MARMOT
THE NATIONAL WEATHER SERVICE IN PORTLAND, OR HAS ESTABLISHED FLOOD
WARNING LEVELS FOR THE FORECAST POINT ON SANDY RIVER AT MARMOT. THE
FLOOD WARNING LEVEL, OR FLOOD STAGE, IS THE RIVER LEVEL AT WHICH A
FLOOD WARNING IS ISSUED BY THE NATIONAL WEATHER SERVICE TO WARN OF
EXPECTED FLOODING IMPACTS.
THE FOLLOWING FLOOD LEVELS HAVE BEEN COORDINATED TO ESTABLISH THE
FOLLOWING FLOOD LEVELS FOR THE SANDY RIVER AT MARMOT WITH CLACKAMAS
COUNTY EMERGENCY MANAGEMENT AND THE PUBLIC DURING A SERIES OF THREE
COMMUNITY MEETINGS. THE NORTHWEST RIVER FORECAST CENTER WAS INVOLVED
IN COORDINATION OF PROPOSED RIVER FLOOD STAGES.
THE FLOOD STAGE AND APPROXIMATE CORRESPONDING DISCHARGE BASED ON THE
LATEST RATING CURVE (9/10/2026):
CURRENT:PROPOSED:
SRMO3 ACTION STAGE / DISCHARGE NA 695.5 FT /09900 CFS
SRMO3 MINOR FLOOD STAGE / DISCHARGENA697.0 FT /16000 CFS
SRMO3 MODERATE STAGE/ DISCHARGE NA698.5 FT /24000 CFS
SRMO3 MAJOR FLOOD STAGE/DISCHARGENA699.5 FT /30600 CFS
THIS CHANGE IS PLANNED TO GO INTO EFFECT ON OR AROUND NOVEMBER 2,
2026.
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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