987  
NOUS45 KREV 142105  
PNSREV  
CAZ071-212115-  
 
PUBLIC INFORMATION STATEMENT  
NATIONAL WEATHER SERVICE RENO NV  
205 PM PDT WED AUG 14 2019  
   
..PUBLIC INFORMATION STATEMENT
 
 
TO: SUBSCRIBERS, EMERGENCY MANAGEMENT OFFICIALS, NEWS MEDIA, AND  
OTHER USERS.  
 
SUBJECT: REFERENCE DATUM CHANGE FOR THE MIDDLE FORK OF THE  
FEATHER RIVER NEAR PORTOLA  
 
ON OCTOBER 1, 2019, THE CALIFORNIA DEPARTMENT OF WATER RESOURCES  
(CADWR) WILL CHANGE THE REFERENCE DATUM USED ON THEIR RIVER GAGE,  
THE MIDDLE FORK OF THE FEATHER RIVER NEAR PORTOLA, TO THE NORTH  
AMERICAN DATUM 1988 (NAVD88). OBSERVED AND FORECAST DATA FOR THE  
MIDDLE FORK OF THE FEATHER RIVER NEAR PORTOLA WILL DISPLAY IN THE  
CURRENT RELATIVE DATUM UNTIL OCTOBER 1, 2019, WHEN IT WILL  
TRANSITION TO DISPLAY IN NAVD88 TRUE ELEVATION ABOVE MEAN SEA  
LEVEL.  
 
THE CHANGE TO NAVD88 WILL AFFECT THE ACTION AND FLOOD STAGES AT  
THIS LOCATION. THE SURFACE ELEVATION OF THE RIVER AT THESE STAGES  
WILL NOT CHANGE, ONLY THE REFERENCE STAGE WILL BE CHANGING. THE  
NEW STAGES ARE OFFSET BY 4843.5 FEET. THE NEW MONITOR AND FLOOD  
STAGES ON OCTOBER 1, 2019 WILL BE:  
 
MIDDLE FORK OF THE FEATHER RIVER NEAR PORTOLA  
NEW/OLD ACTION STAGE: 4851.0 FEET/7.5 FEET  
NEW/OLD FLOOD STAGE: 4852.5 FEET/9.0 FEET  
NEW/OLD MODERATE FLOOD STAGE: 4853.5 FEET/10.0 FEET  
NEW/OLD MAJOR FLOOD STAGE: 4855.5 FEET/12.0 FEET  
 
IF YOU HAVE QUESTIONS OR COMMENTS ON THIS CHANGE PLEASE CONTACT  
TIM BARDSLEY (NATIONAL WEATHER SERVICE RENO), 775-673-8104  
TIM.BARDSLEY@NOAA.GOV  
 
OR BOONE LEK (CADWR), BOONE.LEK@WATER.CA.GOV  
 
TIM BARDSLEY  
SENIOR SERVICE HYDROLOGIST  
 

 
 
HTTP://WEATHER.GOV/RENO  
 
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