091
NGAK88 PAFG 161722
HCMAFG
HYDROMETEOROLOGICAL COORDINATION MESSAGE
ALASKA-PACIFIC RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE ANCHORAGE AK
903 AM AKDT MON JUN 16 2025
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CONTACT:
KYLE VANPEURSEM 907-266-5161 907-350-9219 (CELL PHONE AFTER 5 PM)
LOCATION/KNOWN FLOOD AREA: COLVILLE RIVER FROM UMIAT DOWN TO THE MOUTH
PRODUCT TYPE: WARNING
EXPIRATION TIME: THROUGH FRIDAY
PRIMARY CAUSE: SNOW MELT AND ICE JAMS
BASIS: HIGH WATER FROM RAPID SNOW MELT AND RECENT ICE JAMS IS LEADING TO SIGNIFICANT FLOODING ALONG THE COLVILLE RIVER. AS OF MONDAY MORNING, WATER LEVELS AT
THE USGS COLVILLE RIVER GAGE AT UMIAT WERE AT 62.94 FT AND STILL RISING, THE HIGHEST ON RECORD BY OVER 3 FT SINCE THE GAGE WAS ESTABLISHED IN 2003.
WATER HAS NOW INUNDATED PORTIONS OF THE UMIAT AIRSTRIP AND IS ENCROACHING ON STRUCTURES IN THE CAMP. HIGH WATER EXTENDS DOWNSTREAM TO THE COLVILLE RIVER DELTA
WHERE SEVERAL ICE JAMS HAVE FORMED OVER THE PREVIOUS 24-HRS, LEADING TO FLOODING OF THE EASTERN FLOODPLAIN. ONCE THESE ICE JAMS RELEASE, COMMUNITIES AND INFRASTRUCTURE DOWNSTREAM
SHOULD PREPARE FOR AND EXPECT HIGH WATER AND FLOODING OVER THE NEXT COUPLE OF DAYS. WATER LEVELS ARE EXPECTED TO CONTINUE TO SLOWLY RISE AND LEVEL OFF
THROUGH THE END OF THE WEEK AS ADDITIONAL HIGH ELEVATION SNOW MELT IS EXPECTED TO MAKE ITS WAY DOWNSTREAM.
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