Expires:No;;714741
FGUS86 KPDT 032002
RVSPDT
HYDROLOGIC STATEMENT
NATIONAL WEATHER SERVICE PENDLETON OR
1200 PM PST MON MAR 3 2014
...INFORMATION ON STRUCTURAL DAMAGE AT WANAPUM DAM...
* STRUCTURAL DAMAGE AT WANAPUM DAM WILL CONTINUE TO BE MONITORED AND 
INSPECTED. 
* AT THIS TIME THERE IS VERY LITTLE RISK OF FLOODING. 
* PUBLIC ACCESS TO WANAPUM...PRIEST RAPIDS...ROCK ISLAND AND ROCKY 
REACH RESERVOIRS WILL BE LIMITED.
THE GRANT COUNTY PUD DETECTED STRUCTURAL DAMAGE IN 
WANAPUM DAM IN LATE FEBRUARY. A CRACK WAS DISCOVERED IN ONE OF THE 
SPILLWAY CONCRETE MONOLITHS. THE WANAPUM RESERVOIR HAS BEEN DRAWN 
DOWN MORE THAN 20 FEET TO RELIEVE PRESSURE AND TO FACILITATE 
ADDITIONAL INSPECTIONS AND MONITORING. THERE HAVE BEEN NO 
UNCONTROLLED RELEASES FROM WANAPUM DAM DUE TO THE DAMAGE. IN THE 
EVENT OF A WORST CASE SCENARIO...THE FLOW FROM THE DAM WOULD STILL 
BE LESS THAN AVERAGE SPRING RUNOFF FLOWS...THEREFORE POSING LITTLE 
RISK TO THE PUBLIC FROM FLOODING.  
UPSTREAM OF WANAPUM DAM...THE ROCKY REACH AND ROCK ISLAND DAM 
RESERVOIRS HAVE BOTH BEEN DRAWN DOWN IN ORDER TO EQUALIZE RIVER 
LEVELS IN THE MID COLUMBIA SYSTEM.
AT THIS TIME MANY OF THE PUBLIC BOAT RAMPS IN THE WANAPUM...PRIEST 
RAPIDS...ROCK ISLAND AND ROCKY REACH RESERVOIRS ARE OR WILL BE 
INACCESSIBLE. PLEASE REFER TO WWW.CHELANCOUNTYPUD.ORG AND 
WWW.GRANTPUD.ORG FOR THE LATEST INFORMATION. 
THIS HYDROLOGIC STATEMENT WILL BE UPDATED WHEN THERE ARE SIGNIFICANT 
CHANGES IN THE SITUATION.  
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