Hydrologic Outlook
Issued by NWS Denver/Boulder, CO
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000 FGUS75 KBOU 082307 ESFBOU COC001-005-013-014-019-031-035-039-047-049-057-059-069-073-075-087- 093-095-115-117-121-123-250000- WATER SUPPLY OUTLOOK NATIONAL WEATHER SERVICE DENVER CO 507 PM MDT WED APR 8 2015 NATIONAL WEATHER SERVICE/NATURAL RESOURCES CONSERVATION SERVICE STREAMFLOW FORECASTS FOR NORTH CENTRAL AND NORTHEAST COLORADO AS OF APRIL 2015. MARCH IS TRADITIONALLY THE SNOWIEST MONTH OF THE YEAR FOR MANY MOUNTAIN LOCATIONS. HOWEVER...MOUNTAIN SNOWPACK HAS HELD STEADY OR DECLINED DURING THE PAST MONTH. BASIN SNOWPACK WAS 84 PERCENT OF NORMAL IN THE SOUTH PLATTE BASIN...71 PERCENT OF NORMAL IN THE NORTH PLATTE BASIN AND ONLY 68 PERCENT OF NORMAL IN THE UPPER COLORADO RIVER BASIN ON APRIL 8TH. SUB-BASIN SNOWPACK ON APRIL 1ST RANGED FROM 71 PERCENT OF NORMAL IN THE WILLOW CREEK BASIN IN GRAND COUNTY TO 98 PERCENT OF AVERAGE IN THE BLUE RIVER BASIN IN SUMMIT COUNTY WEST OF THE CONTINENTAL DIVIDE. HISTORICALLY NORTH CENTRAL COLORADO HAS ACCUMULATED OVER 90 PERCENT OF ITS SNOWPACK BY THE SECOND WEEK OF APRIL. RESERVOIR STORAGE REMAINS ABOVE AVERAGE. COMBINED STORAGE WAS 114 PERCENT OF AVERAGE IN THE SOUTH PLATTE BASIN AND 124 PERCENT OF AVERAGE IN THE UPPER COLORADO RIVER BASIN AT THE END OF MARCH. STORAGE WAS 91 PERCENT OF CAPACITY IN THE SOUTH PLATTE BASIN AND 78 PERCENT OF CAPACITY IN THE UPPER COLORADO RIVER BASIN. MANY STREAMS ARE RUNNING ABOVE AVERAGE DESPITE THE STAGNANT MOUNTAIN SNOWPACK CONDITIONS. THIS IS DUE TO EARLY SNOWPACK MELT AND RUNOFF AS ABOVE AVERAGE TEMPERATURES PERSIST. WITH THE LACK OF PRECIPITATION THIS SPRING AND THE EARLY MELTOUT...APRIL THROUGH JULY STREAMFLOW FORECASTS ARE BELOW TO NEAR AVERAGE. THE NORTH PLATTE RIVER NEAR NORTHGATE IS FORECAST TO HAVE ONLY HALF ITS AVERAGE STREAM VOLUMES THIS SPRING AND SUMMER. IN CONTRAST...THE BLUE RIVER IS EXPECTED TO SEE AVERAGE VOLUMES. FOLLOWING ARE THE STREAMFLOW FORECASTS FOR SELECTED LOCATIONS: MOST PROBABLE FORECAST VOLUME PERCENT STREAM AND STATION PERIOD 1000 AF OF AVG __________________ ______ _______ _______ SOUTH PLATTE RIVER ANTERO RESERVOIR INFLOW APR-JUL 11.2 77 SPINNEY MTN RES INFLOW APR-JUL 41 85 11-MILE CANYON RES INFLOW APR-JUL 43 86 CHEESMAN LAKE INFLOW APR-JUL 80 80 SOUTH PLATTE APR-JUL 131 73 BEAR CREEK EVERGREEN ABV APR-JUL 12.3 75 CLEAR CREEK GOLDEN APR-JUL 87 83 ST VRAIN CREEK LYONS APR-JUL 76 86 BOULDER CREEK ORODELL APR-JUL 50 93 SOUTH BOULDER CREEK ELDORADO SPRINGS APR-JUL 33 85 BIG THOMPSON RIVER CANYON MOUTH APR-JUL 75 83 CACHE LA POUDRE CANYON MOUTH APR-JUL 182 81 NORTH PLATTE RIVER NORTHGATE APR-JUL 110 49 COLORADO RIVER LAKE GRANBY APR-JUL 205 93 WILLOW CREEK WILLOW CREEK RES APR-JUL 39 83 FRASER RIVER WINTER PARK APR-JUL 18.0 93 WILLIAMS FORK RIVER WILLIAMS FORK RES APR-JUL 90 94 BLUE RIVER DILLON RES APR-JUL 170 104 GREEN MTN RES APR-JUL 275 100 MUDDY CREEK WOLFORD MTN RES BLW APR-JUL 40 74 COLORADO RIVER KREMMLING APR-JUL 800 93 THESE FORECASTS REFLECT NATURAL FLOW ONLY. ACTUAL OBSERVED FLOW WILL LIKELY BE AFFECTED BY UPSTREAM WATER MANAGEMENT. ADDITIONAL SUPPORTIVE INFORMATION (WEB ADDRESSES ARE IN LOWER CASE): -VISIT OUR WEB SITE AT WWW.WEATHER.GOV/BOU FOR MORE LOCAL WEATHER...CLIMATE AND STREAM INFORMATION. -LONG RANGE PRECIPITATION AND TEMPERATURE OUTLOOKS ARE AVAILABLE AT HTTP://WWW.CPC.NCEP.NOAA.GOV/PRODUCTS/PREDICTIONS/. -SNOWPACK AND RESERVOIR DATA ARE AVAILABLE FROM THE NATURAL RESOURCES CONSERVATIONS SERVICE AT HTTP://WWW.CO.NRCS.USDA.GOV/SNOW/. -THE U.S. DROUGHT MONITOR IS AVAILABLE AT HTTP://DROUGHT.UNL.EDU/DM/MONITOR.HTML. $$ TH

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Page last modified: 8-Apr-2015 11:07 PM
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