Extended Streamflow Prediction
Issued by NWS Missouri Basin, Pleasant Hill

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FGUS63 KKRF 151826
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MISSOURI  BASIN RIVER  FORECAST  CENTER WATER  SUPPLY  STATEMENT
ISSUED IN COOPERATION WITH NATURAL RESOURCES CONSERVATION SERVICE
ISSUED:  APRIL 15, 2015

UPPER MISSOURI BASIN

THE HIGH ELEVATION SNOW PACK IN THE UPPER MISSOURI BASIN AS OF
APRIL 1 WAS BELOW AVERAGE.  THE SNOW PACK ABOVE TOSTON,  MONTANA
WAS 77 PERCENT OF AVERAGE.  THE SNOW PACK BETWEEN TOSTON AND FORT
PECK, MONTANA WAS 67 PERCENT.  THE SNOW PACK IN THE ST MARY AND
MILK RIVER BASINS WAS 53 PERCENT.

MARCH PRECIPITATION ACROSS THE UPPER MISSOURI BASIN RANGED FROM AVERAGE
TO BELOW AVERAGE.  BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN
INCLUDE: MILK ST. MARY,  105 PERCENT; MILK CANADA, 86 PERCENT;
LOWER MILK, 112 PERCENT; ABOVE TOSTON, 38 PERCENT; TOSTON TO
FT. PECK, 53 PERCENT.

STREAM FLOW IN THE UPPER MISSOURI BASIN IS FORECAST TO BE BELOW
AVERAGE DURING THE UPCOMING SPRING AND SUMMER.  THE ST. MARY
RIVER IS FORECAST TO HAVE 80 PERCENT OF AVERAGE APRIL-SEPTEMBER
FLOWS.  RUNOFF IS EXPECTED TO RANGE AROUND 55 PERCENT OF AVERAGE
FOR THE MISSOURI BASIN ABOVE FORT PECK, MONTANA.

OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA:  LIMA RESERVOIR
HAD 141 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 87 PERCENT
OF AVERAGE WATER, GIBSON RESERVOIR HAD 122 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 152 PERCENT OF AVERAGE STORED WATER.
THE  MAJOR  HYDROELECTRIC  RESERVOIRS  IN  MONTANA (CANYON  FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE NEAR AVERAGE RANGE; 105 AND 118
PERCENT OF AVERAGE WATER, RESPECTIVELY.

YELLOWSTONE BASIN

THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS ABOVE
AVERAGE ON APRIL 1.  THE SNOW PACK IN THE UPPER YELLOWSTONE
BASIN WAS 78 PERCENT OF AVERAGE OVERALL.  THE SNOW PACKS IN THE WIND,
BIGHORN, AND SHOSHONE BASINS WERE 74, 91, AND 75 PERCENT OF AVERAGE,
RESPECTIVELY.  THE SNOW PACKS IN THE TONGUE AND POWDER BASINS WERE
79 AND 91 PERCENT OF AVERAGE, RESPECTIVELY.

PRECIPITATION DURING MARCH WAS BELOW AVERAGE.  THE UPPER
YELLOWSTONE RIVER BASIN RECEIVED 38 PERCENT OF AVERAGE PRECIPITATION
WHILE THE LOWER YELLOWSTONE BASIN REPORTED 40 PERCENT OF AVERAGE.
THE BIGHORN BASIN RECEIVED 34 PERCENT OF AVERAGE PRECIPITATION WHILE
THE WIND RIVER BASIN RECEIVED 58 PERCENT OF AVERAGE. THE LITTLE
BIGHORN - UPPER TONGUE BASIN RECEIVED 34 PERCENT OF AVERAGE
AND THE POWDER RIVER HAD 38 PERCENT OF AVERAGE PRECIPITATION.

FORECAST STREAM FLOW IN THE YELLOWSTONE BASIN IS BELOW AVERAGE
FOR THE UPCOMING SPRING AND SUMMER.  STREAM FLOW FOR THE WIND-BIGHORN
BASIN ABOVE ST. XAVIER, MONTANA IS FORECAST TO BE ABOUT 55 PERCENT OF
AVERAGE.  FLOW IN THE TONGUE BASIN IS EXPECTED TO BE ABOUT 70 PERCENT
OF AVERAGE.  FLOWS IN THE POWDER RIVER ARE EXPECTED TO BE ABOUT 70
PERCENT OF AVERAGE.

MONTHEND STORAGE AT BOYSEN RESERVOIR WAS 127 PERCENT OF AVERAGE.
STORED WATER IN BUFFALO BILL RESERVOIR WAS 137 PERCENT OF AVERAGE.
MONTHEND STORAGE WAS 108 PERCENT OF AVERAGE AT BIGHORN RESERVOIR.

PLATTE BASIN

THE HIGH ELEVATION  SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
69 PERCENT OF AVERAGE ON APRIL 1.  THE SNOW PACK IN THE NORTH
PLATTE  BASIN BELOW SEMINOE RESERVOIR WAS 59 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 82 PERCENT OF AVERAGE.

MARCH PRECIPITATION ACROSS THE PLATTE BASIN WAS BELOW AVERAGE.
PRECIPITATION DURING MARCH IN THE NORTH PLATTE BASIN ABOVE SEMINOE
RESERVOIR WAS 78 PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN BETWEEN
SEMINOE RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS 58 PERCENT
OF AVERAGE. THE NORTH PLATTE BASIN BELOW GUERNSY RESERVOIR HAD 28 PERCENT
OF AVERAGE PRECIPITATION.  THE HIGH ELEVATIONS OF THE SOUTH PLATTE
BASIN HAD 55 PERCENT OF AVERAGE PRECIPITATION WHEREAS THE PLAINS HAD
29 PERCENT OF AVERAGE MARCH PRECIPITATION.

STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO BE BELOW AVERAGE
DURING THE UPCOMING SPRING AND SUMMER. RUNOFF FOR STREAMS
ABOVE SEMINOE RESERVOIR ARE EXPECTED TO BE ABOUT 50 PERCENT
OF AVERAGE.  STREAM FLOWS FOR THE NORTH PLATTE BELOW SEMINOE
RESERVOIR ARE FORECAST TO BE 35 PERCENT OF AVERAGE. STREAMS
IN THE SOUTH PLATTE BASIN ABOVE SOUTH PLATTE, COLORADO CAN EXPECT
80 PERCENT OF AVERAGE FLOW. FOR THE REMAINDER OF THE SOUTH
PLATTE BASIN FLOWS ARE EXPECTED NEAR 85 PERCENT OF AVERAGE.

STORED WATER IN THE SOUTH PLATTE BASIN WAS 114 PERCENT OF AVERAGE
ON APRIL 1.  STORED WATER IN THE NORTH PLATTE BASIN WAS 101
PERCENT OF AVERAGE



WATER SUPPLY FORECAST NWS MISSOURI BASIN RIVER FORECAST CENTER
PLEASANT HILL MO 1120 AM CDT TUE APR 7 2015

DISSEMINATED WITH PERMISSION OF THE
US NATURAL RESOURCES CONSERVATION SERVICE

DATA CURRENT AS OF: APRIL 05 2015
BASED ON APRIL 1 2015 FORECAST VALUES


PRELIMINARY MISSOURI/YELLOWSTONE/PLATTE RIVER BASIN FORECASTS
                                           50% % OF  MAX   MIN  30-YR
FORECAST POINT                    PERIOD  (KAF) AVG (KAF) (KAF)  AVG
--------------                    ------  --------- ----- ----- -----
ST. MARY R NR BABB (2)            APR-JUL   285  77   350   220   370
                                  APR-SEP   340  80   415   265   425
LIMA RESERVOIR INFLOW (2)         APR-JUL  16.4  20    34  1.00    82
                                  APR-SEP  15.0  17    35  1.00    89
CLARK CANYON RESERVOIR INFLOW (2) APR-JUL  17.5  17    84 -16.0   101
                                  APR-SEP    25  21    95  -5.0   120
BEAVERHEAD R AT BARRETTS (2)      APR-JUL    41  32   146  15.0   129
                                  APR-SEP    56  36   180    22   156
BIG HOLE R NR MELROSE             APR-JUL   440  85   595   285   515
                                  APR-SEP   480  86   650   310   560
RUBY R RESERVOIR INFLOW (2)       APR-JUL    26  34    49   3.8    77
                                  APR-SEP    35  38    62   9.1    91
HEBGEN RESERVOIR INFLOW (2)       APR-JUL   235  64   285   184   370
                                  APR-SEP   305  65   365   250   470
ENNIS RESERVOIR INFLOW (2)        APR-JUL   375  60   490   255   625
                                  APR-SEP   475  61   615   340   775
GALLATIN R NR GATEWAY             APR-JUL   305  76   395   215   400
                                  APR-SEP   360  77   465   255   470
GALLATIN R AT LOGAN               APR-JUL   315  72   475   158   440
                                  APR-SEP   365  72   550   184   505
MISSOURI R AT TOSTON (2)          APR-JUL  1010  56  1580   440  1790
                                  APR-SEP  1150  56  1840   465  2070
MISSOURI R AT FORT BENTON (2)     APR-JUL  1440  55  2300   585  2610
                                  APR-SEP  1740  56  2800   685  3110
MISSOURI R NR VIRGELLE (2)        APR-JUL  1630  54  2620   635  3000
                                  APR-SEP  1950  55  3170   735  3520
MISSOURI R NR LANDUSKY (2)        APR-JUL  1650  52  2650   645  3160
                                  APR-SEP  2000  54  3240   760  3720
MISSOURI R BL FT PECK DAM (2)     APR-JUL  1500  46  2640   360  3240
                                  APR-SEP  1690  46  3160   225  3700
LAKE SAKAKAWEA INFLOW (2)         APR-JUL  5210  63  7980  2430  8310
                                  APR-SEP  5810  62  9350  2280  9400
SHEEP CK NR WHITE SULPHUR SPRINGS APR-JUL  13.9  90  19.3   8.5  15.5
                                  APR-SEP  16.7  91    23  10.1  18.4
GIBSON RESERVOIR INFLOW (2)       APR-JUL   285  72   370   205   395
                                  APR-SEP   320  73   410   230   440
MARIAS R NR SHELBY (2)            APR-JUL   157  46   320    40   345
                                  APR-SEP   160  44   340    64   360
NF MUSSELSHELL R NR DELPINE       APR-JUL   2.7  79   4.6  1.00   3.4
                                  APR-SEP   3.2  80   5.4  1.07   4.0
SF MUSSELSHELL R AB MARTINSDALE   APR-JUL  19.6  56    47  1.00    35
                                  APR-SEP    22  58    51  1.00    38
MUSSELSHELL R AT HARLOWTON (2)    APR-JUL    33  58    84  -2.0    57
                                  APR-SEP    33  56    89  -2.0    59
YELLOWSTONE R AT YELLOWSTONE LAKE APR-JUL   410  71   505   315   575
                                  APR-SEP   535  69   660   410   770
YELLOWSTONE R AT CORWIN SPRINGS   APR-JUL  1350  85  1630  1060  1590
                                  APR-SEP  1570  84  1920  1230  1880
YELLOWSTONE R AT LIVINGSTON       APR-JUL  1540  86  1900  1180  1800
                                  APR-SEP  1800  84  2230  1370  2140
YELLOWSTONE R AT BILLINGS         APR-JUL  2790  86  3630  1950  3230
                                  APR-SEP  3180  85  4200  2170  3730
YELLOWSTONE R AT MILES CITY (2)   APR-JUL  3760  79  5190  2330  4780
                                  APR-SEP  4250  78  6070  2430  5450
YELLOWSTONE R NR SIDNEY (2)       APR-JUL  3710  77  5390  2030  4830
                                  APR-SEP  4100  76  6230  1970  5430
BOULDER R AT BIG TIMBER           APR-JUL   235  84   300   167   280
                                  APR-SEP   250  83   330   171   300
STILLWATER R NR ABSAROKEE (2)     APR-JUL   410  92   510   315   445
                                  APR-SEP   480  92   595   365   520
CLARKS FK YELLOWSTONE R NR BELFRY APR-JUL   525 103   610   440   510
                                  APR-SEP   565 103   660   470   550
BOYSEN RESERVOIR INFLOW (2)       APR-JUL   290  48   625    50   610
                                  APR-SEP   325  49   695    50   665
BIGHORN R AT KANE (2)             APR-JUL   430  51   945    60   840
                                  APR-SEP   455  50  1030    45   905
BIGHORN R NR ST. XAVIER (2)       APR-JUL   890  64  1500   280  1380
                                  APR-SEP   920  63  1620   220  1460
GREYBULL R NR MEETEETSE           APR-JUL   101  77   145    57   131
                                  APR-SEP   137  77   191    83   177
SHELL CK NR SHELL                 APR-JUL    47  85    61    33    55
                                  APR-SEP    59  89    75    42    66
BUFFALO BILL RESERVOIR INFLOW (2) APR-JUL   600  89   730   465   675
                                  APR-SEP   660  89   820   500   745
LITTLE BIGHORN R NR HARDIN        APR-JUL    81  83   122    39    98
                                  APR-SEP    95  86   141    49   111
TONGUE R NR DAYTON (2)            APR-JUL    66  77    93    39    86
                                  APR-SEP    75  77   105    45    98
TONGUE RIVER RESERVOIR INFLOW (2) APR-JUL   129  67   230    31   193
                                  APR-SEP   146  68   250    41   215
ROCK CK NR BUFFALO                APR-JUL  14.0  75    21   6.8  18.6
                                  APR-SEP  17.0  77    25   9.4    22
NF POWDER R NR HAZELTON           APR-JUL   8.0  88  10.4   5.6   9.1
                                  APR-SEP   8.6  87  11.2   6.0   9.9
POWDER R AT MOORHEAD              APR-JUL   123  69   240   7.9   177
                                  APR-SEP   140  71   260    21   196
POWDER R NR LOCATE                APR-JUL   138  69   275   6.0   199
                                  APR-SEP   155  70   305   6.3   220


UPPER NORTH PLATTE RIVER BASIN
                                           50% % OF  MAX   MIN  30-YR
FORECAST POINT                    PERIOD  (KAF) AVG (KAF) (KAF)  AVG
--------------                    ------  --------- ----- ----- -----
NORTH PLATTE R NR NORTHGATE       APR-JUL   110  49   205  17.5   225
                                  APR-SEP   125  50   230  19.4   250
ENCAMPMENT R NR ENCAMPMENT        APR-JUL    61  47    96    25   129
                                  APR-SEP    65  47   103    27   138
ROCK CK NR ARLINGTON              APR-JUL    37  76    50    24    49
                                  APR-SEP    39  75    53    25    52
SEMINOE RESERVOIR INFLOW (2)      APR-JUL   335  47   700   130   715
                                  APR-SEP   365  47   760   140   770


LOWER NORTH PLATTE, SWEETWATER & LARAMIE RIVER BASINS
                                           50% % OF  MAX   MIN  30-YR
FORECAST POINT                    PERIOD  (KAF) AVG (KAF) (KAF)  AVG
--------------                    ------  --------- ----- ----- -----
SWEETWATER R NR ALCOVA            APR-JUL  17.5  30    46  1.00    59
                                  APR-SEP    20  31    51  1.00    64
LA PRELE CK AB LA PRELE RESERVOIR APR-JUL   2.8  14  15.6  0.20  19.9
                                  APR-SEP   2.8  14  15.7  0.20  19.9
NORTH PLATTE BL GLENDO RES  (2)   APR-JUL   300  37   560    35   820
                                  APR-SEP   300  35   580    22   850
NORTH PLATTE BL GUERNSEY RES (2)  APR-JUL   290  35   615    25   820
                                  APR-SEP   300  35   640    25   850
LARAMIE R NR WOODS                APR-JUL    77  67   116    38   115
                                  APR-SEP    85  67   130    42   126
LITTLE LARAMIE R NR FILMORE       APR-JUL    36  71    52  19.6    51
                                  APR-SEP    39  71    58    20    55


SOUTH PLATTE RIVER BASIN
                                           50% % OF  MAX   MIN  30-YR
FORECAST POINT                    PERIOD  (KAF) AVG (KAF) (KAF)  AVG
--------------                    ------  --------- ----- ----- -----
ANTERO RESERVOIR INFLOW           APR-JUL  11.2  77  16.4   6.0  14.5
                                  APR-SEP  13.8  78    20   7.6  17.8
SPINNEY MOUNTAIN RES INFLOW (2)   APR-JUL    41  85    76    22    48
                                  APR-SEP    50  82    97    26    61
ELEVENMILE CANYON RES INFLOW (2)  APR-JUL    43  86    82    23    50
                                  APR-SEP    54  84   110    26    64
CHEESMAN LAKE INFLOW (2)          APR-JUL    80  80   158    41   100
                                  APR-SEP   101  80   205    50   126
SOUTH PLATTE R AT S PLATTE (2)    APR-JUL   131  73   285    61   180
                                  APR-SEP   164  73   360    75   225
BEAR CK AB EVERGREEN              APR-JUL  12.3  75    27   5.7  16.4
                                  APR-SEP  14.8  70    31   7.0    21
CLEAR CK AT GOLDEN                APR-JUL    87  83   118    56   105
                                  APR-SEP   110  86   152    68   128
ST. VRAIN CK AT LYONS (2)         APR-JUL    76  86    93    59    88
                                  APR-SEP    88  85   108    68   103
BOULDER CK NR ORODELL (2)         APR-JUL    50  93    61    39    54
                                  APR-SEP    59  94    74    44    63
S BOULDER CK NR ELDORADO SPRGS(2) APR-JUL    33  85    42    24    39
                                  APR-SEP    37  86    48    26    43
BIG THOMPSON R AT CANYON MTH (2)  APR-JUL    75  83    97    53    90
                                  APR-SEP    92  86   119    65   107
CACHE LA POUDRE AT CANYON MTH (2) APR-JUL   182  81   275   121   225
                                  APR-SEP   205  82   305   136   250

 MAX (10%), 30%, 50%, 70% AND MIN (90%) CHANCE THAT ACTUAL VOLUME
 WILL EXCEED FORECAST.  AVERAGES ARE FOR THE 1981-2010 PERIOD.
 ALL VOLUMES ARE IN THOUSANDS OF ACRE-FEET.

 FOOTNOTES:
 1) MAX AND MIN ARE 5% AND 95% CHANCE THAT ACTUAL VOLUME WILL EXCEED FORECAST
 2) STREAMFLOW IS ADJUSTED FOR UPSTREAM STORAGE
 3) MEDIAN VALUE USED IN PLACE OF AVERAGE



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