Extended Streamflow Prediction
Issued by NWS Missouri Basin, Pleasant Hill

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FGUS63 KKRF 151629
ESPKRF

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


UPPER MISSOURI BASIN

THE HIGH ELEVATION SNOW PACK IN THE UPPER MISSOURI BASIN AS OF MAY 1
WAS BELOW AVERAGE.  THE SNOW PACK ABOVE TOSTON,  MONTANA WAS 71
PERCENT OF AVERAGE.  THE SNOW PACK BETWEEN TOSTON AND FORT PECK,
MONTANA WAS 59 PERCENT.  THE SNOW PACK IN THE ST MARY AND MILK RIVER
BASINS WAS 47 PERCENT.

APRIL PRECIPITATION ACROSS THE UPPER MISSOURI BASIN RANGED FROM
AVERAGE TO BELOW AVERAGE.  BASIN PRECIPITATION SUMMARIES FOR THE
MISSOURI BASIN INCLUDE: MILK ST. MARY,  45 PERCENT; MILK CANADA, 37
PERCENT;  LOWER MILK, 81 PERCENT; ABOVE TOSTON, 80 PERCENT; TOSTON
TO FT. PECK, 67 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 77 PERCENT OF AVERAGE MAY-SEPTEMBER FLOWS.
RUNOFF IS EXPECTED TO RANGE AROUND 43 PERCENT OF AVERAGE FOR THE
MISSOURI BASIN ABOVE FORT PECK, MONTANA.

OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA:  LIMA RESERVOIR
HAD 99 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 85 PERCENT
OF AVERAGE WATER, GIBSON RESERVOIR HAD 129 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 125 PERCENT OF AVERAGE STORED WATER.

THE  MAJOR  HYDROELECTRIC  RESERVOIRS  IN  MONTANA (CANYON  FERRY
AND FORT PECK) HAD MONTHEND STORAGE IN THE NEAR AVERAGE RANGE; 106
AND 117 PERCENT OF AVERAGE WATER, RESPECTIVELY.

YELLOWSTONE BASIN

THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS BELOW
AVERAGE ON MAY 1.  THE SNOW PACK IN THE UPPER YELLOWSTONE BASIN WAS
71 PERCENT OF AVERAGE OVERALL.  THE SNOW PACKS IN THE WIND, BIGHORN,
AND SHOSHONE BASINS WERE 64, 69, AND 60 PERCENT OF AVERAGE,
RESPECTIVELY.  THE SNOW PACKS IN THE TONGUE AND POWDER BASINS WERE
82 AND 73 PERCENT OF AVERAGE, RESPECTIVELY.

PRECIPITATION DURING APRIL WAS AVERAGE TO BELOW AVERAGE.  THE UPPER
YELLOWSTONE RIVER BASIN RECEIVED 74 PERCENT OF AVERAGE PRECIPITATION
WHILE THE LOWER YELLOWSTONE BASIN REPORTED 61 PERCENT OF AVERAGE.
THE BIGHORN BASIN RECEIVED 73 PERCENT OF AVERAGE PRECIPITATION WHILE
THE WIND RIVER BASIN RECEIVED 98 PERCENT OF AVERAGE. THE LITTLE
BIGHORN - UPPER TONGUE BASIN RECEIVED 82 PERCENT OF AVERAGE AND THE
POWDER RIVER HAD 78 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 40 PERCENT
OF AVERAGE.  FLOW IN THE TONGUE BASIN IS EXPECTED TO BE ABOUT 76
PERCENT OF AVERAGE.  FLOWS IN THE POWDER RIVER ARE EXPECTED TO BE
ABOUT 50 PERCENT OF AVERAGE.

MONTHEND STORAGE AT BOYSEN RESERVOIR WAS 127 PERCENT OF AVERAGE.
STORED WATER IN BUFFALO BILL RESERVOIR WAS 148 PERCENT OF AVERAGE.
MONTHEND STORAGE WAS 107 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 MAY 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.

APRIL PRECIPITATION ACROSS THE PLATTE BASIN WAS ABOVE AVERAGE.
PRECIPITATION DURING APRIL IN THE NORTH PLATTE BASIN ABOVE SEMINOE
RESERVOIR WAS 87 PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN
BETWEEN SEMINOE RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS
155 PERCENT OF AVERAGE. THE NORTH PLATTE BASIN BELOW GUERNSY
RESERVOIR HAD 190 PERCENT OF AVERAGE PRECIPITATION.  THE HIGH
ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 157 PERCENT OF AVERAGE
PRECIPITATION WHEREAS THE PLAINS HAD 214 PERCENT OF AVERAGE APRIL
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 25 PERCENT OF AVERAGE. STREAMS IN THE SOUTH PLATTE
BASIN ABOVE SOUTH PLATTE, COLORADO CAN EXPECT 95 PERCENT OF AVERAGE
FLOW. FOR THE REMAINDER OF THE SOUTH PLATTE BASIN FLOWS ARE EXPECTED
NEAR 90 PERCENT OF AVERAGE.

STORED WATER IN THE SOUTH PLATTE BASIN WAS 113 PERCENT OF AVERAGE ON
MAY 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 MAY 12 2015

DISSEMINATED WITH PERMISSION OF THE
US NATURAL RESOURCES CONSERVATION SERVICE

DATA CURRENT AS OF: MAY 06 2015
BASED ON MAY 01 2015 FORECAST VALUES


FINAL 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)            MAY-JUL   260   76   320  199  340
                                  MAY-SEP   305   77   375  235  395
LIMA RESERVOIR INFLOW (2)         MAY-JUL   8.0   14    22 1.00   57
                                  MAY-SEP   8.0   13    22 1.00   64
CLARK CANYON RESERVOIR INFLOW (2) MAY-JUL   -20  -31    39  -51   64
                                  MAY-SEP -13.0  -16    50  -50   83
BEAVERHEAD R AT BARRETTS (2)      MAY-JUL  -5.8   -7    88  -44   85
                                  MAY-SEP   8.0    7   120  -40  111
BIG HOLE R NR MELROSE             MAY-JUL   335   76   440  235  440
                                  MAY-SEP   375   78   490  260  480
RUBY R RESERVOIR INFLOW (2)       MAY-JUL    26   39    49  2.5   67
                                  MAY-SEP    36   44    63  8.6   82
HEBGEN RESERVOIR INFLOW (2)       MAY-JUL   154   50   205  102  305
                                  MAY-SEP   220   54   280  159  405
ENNIS RESERVOIR INFLOW (2)        MAY-JUL   265   50   375  154  530
                                  MAY-SEP   370   54   500  235  680
GALLATIN R NR GATEWAY             MAY-JUL   240   65   310  172  370
                                  MAY-SEP   285   65   365  205  440
GALLATIN R AT LOGAN               MAY-JUL   194   51   320   66  380
                                  MAY-SEP   245   55   400   89  445
MISSOURI R AT TOSTON              MAY-JUL   615   42  1080  149 1480
                                  MAY-SEP   740   42  1320  160 1760
MISSOURI R AT FORT BENTON (2)     MAY-JUL   900   41  1560  240 2190
                                  MAY-SEP  1180   44  2030  330 2680
MISSOURI R NR VIRGELLE (2)        MAY-JUL  1070   43  1820  320 2510
                                  MAY-SEP  1370   45  2360  380 3030
MISSOURI R NR LANDUSKY (2)        MAY-JUL  1060   40  1790  330 2650
                                  MAY-SEP  1390   43  2360  425 3200
MISSOURI R BLW FT PECK DAM (2)    MAY-JUL  1100   41  1880  123 2700
                                  MAY-SEP  1280   41  2480   84 3160
LAKE SAKAKAWEA INFLOW (2)         MAY-JUL  3910   54  5690 2130 7230
                                  MAY-SEP  4490   54  7120 1860 8320
SHEEP CK NR WHITE SULPHUR SPRINGS MAY-JUL  11.3   84  16.3  6.3 13.4
                                  MAY-SEP  13.9   86    20  7.8 16.2
GIBSON RESERVOIR INFLOW (2)       MAY-JUL   240   68   305  174  355
                                  MAY-SEP   275   70   345  200  395
MARIAS R NR SHELBY (2)            MAY-JUL   124   44   270 10.0  285
                                  MAY-SEP   121   40   280 10.0  300
NF MUSSELSHELL R NR DELPINE       MAY-JUL   2.9   88   5.3 0.50  3.3
                                  MAY-SEP   3.6   88   6.5 0.81  4.1
SF MUSSELSHELL R AB MARTINSDALE   MAY-JUL    24   65    56 1.00   37
                                  MAY-SEP    26   65    59 1.00   40
MUSSELSHELL R AT HARLOWTON (2)    MAY-JUL    31   65    83 -5.0   48
                                  MAY-SEP    32   64    87 -4.0   50
MILK R AT WESTERN CROSSING        MAY-JUL  10.6   65    23 1.00 16.3
                                  MAY-SEP  12.0   68    26 1.00 17.7
YELLOWSTONE R AT YELLOWSTONE LAKE MAY-JUL   300   55   400  200  545
                                  MAY-SEP   400   54   525  275  735
YELLOWSTONE R AT CORWIN SPRINGS   MAY-JUL  1070   72  1330  815 1480
                                  MAY-SEP  1270   72  1580  955 1770
YELLOWSTONE R AT LIVINGSTON       MAY-JUL  1210   72  1530  895 1670
                                  MAY-SEP  1450   72  1830 1070 2010
YELLOWSTONE R AT BILLINGS         MAY-JUL  2230   74  2920 1550 3000
                                  MAY-SEP  2600   74  3450 1750 3490
YELLOWSTONE R AT MILES CITY (2)   MAY-JUL  2910   67  3850 1960 4370
                                  MAY-SEP  3370   67  4620 2120 5030
YELLOWSTONE R NR SIDNEY (2)       MAY-JUL  2770   63  3910 1640 4380
                                  MAY-SEP  3130   63  4620 1630 4980
BOULDER R AT BIG TIMBER           MAY-JUL   210   78   260  161  270
                                  MAY-SEP   225   78   285  165  290
STILLWATER R NR ABSAROKEE (2)     MAY-JUL   365   87   450  280  420
                                  MAY-SEP   435   88   535  330  495
CLARKS FK YELLOWSTONE R NR BELFRY MAY-JUL   425   89   495  355  480
                                  MAY-SEP   460   88   545  375  525
BOYSEN RESERVOIR INFLOW (2)       MAY-JUL   255   46   500  7.6  560
                                  MAY-SEP   295   48   580  9.1  615
BIGHORN R AT KANE (2)             MAY-JUL   310   40   625  5.0  770
                                  MAY-SEP   340   41   690  5.0  830
BIGHORN R NR ST. XAVIER (2)       MAY-JUL   620   49  1010  225 1260
                                  MAY-SEP   650   49  1090  210 1340
GREYBULL R NR MEETEETSE           MAY-JUL    79   64   101   57  124
                                  MAY-SEP   113   66   160   66  170
SHELL CK NR SHELL                 MAY-JUL    42   81    56   28   52
                                  MAY-SEP    53   84    68   38   63
BUFFALO BILL RESERVOIR INFLOW (2) MAY-JUL   455   72   580  330  630
                                  MAY-SEP   515   74   655  375  700
LITTLE BIGHORN R NR HARDIN        MAY-JUL    67   79   110   24   85
                                  MAY-SEP    74   76   123   25   97
TONGUE R NR DAYTON (ADJ)          MAY-JUL    61   76    85   37   80
                                  MAY-SEP    72   78    98   46   92
TONGUE RIVER RESERVOIR INFLOW (2) MAY-JUL   116   66   205   26  175
                                  MAY-SEP   135   68   230   39  198
ROCK CK NR BUFFALO                MAY-JUL  12.4   70    20  4.4 17.7
                                  MAY-SEP  15.6   74    24  7.0   21
NF POWDER R NR HAZELTON           MAY-JUL   5.5   66   8.1  2.8  8.3
                                  MAY-SEP   6.1   68   8.9  3.2  9.0
POWDER R AT MOORHEAD              MAY-JUL    63   42   148  2.0  151
                                  MAY-SEP    81   48   171  2.0  170
POWDER R NR LOCATE                MAY-JUL    65   40   174 1.00  164
                                  MAY-SEP    82   44   200 1.00  185


UPPER NORTH PLATTE RIVER BASIN
                                          50%  % OF  MAX   MIN  30-YR
FORECAST POINT                    PERIOD (KAF)  AVG (KAF) (KAF)  AVG
--------------                    ------ ----- ---- ----- ----- -----
NORTH PLATTE R NR NORTHGATE       MAY-JUL   70   37   152 -12.0  187
                                  MAY-SEP   80   38   170 -10.1  210
ENCAMPMENT R NR ENCAMPMENT        MAY-JUL   48   41    86  10.1  118
                                  MAY-SEP   53   42    94  12.0  127
ROCK CK ABV KING CANYON CANAL     MAY-JUL   38   79    49    27   48
                                  MAY-SEP   40   80    51    29   50
SEMINOE RESERVOIR INFLOW (2)      MAY-JUL  215   35   510    50  615
                                  MAY-SEP  240   36   560    50  670


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            MAY-JUL  8.8   19    32  1.00   46
                                  MAY-SEP 11.2   22    36  1.00   50
LA PRELE CK AB LA PRELE RESERVOIR MAY-JUL  5.0   34  14.0  0.20 14.9
                                  MAY-SEP  5.0   34  13.9  0.20 14.8
NORTH PLATTE RIVER BLW GLENDO RES MAY-JUL  153   23   470  -164  670
                                  MAY-SEP  155   22   481  -171  700
NORTH PLATTE R BL GUERNSEY RES (2)MAY-JUL  159   24   455   5.0  670
                                  MAY-SEP  175   25   480   5.0  700
LARAMIE R & PIONEER CA NR WOODS (AMAY-JUL   68   63   100    36  108
                                  MAY-SEP   75   63   110    40  119
LITTLE LARAMIE R NR FILMORE       MAY-JUL   37   77    51    23   48
                                  MAY-SEP   40   77    55    25   52


SOUTH PLATTE RIVER BASIN
                                          50%  % OF  MAX   MIN  30-YR
FORECAST POINT                    PERIOD (KAF)  AVG (KAF) (KAF)  AVG
--------------                    ------ ----- ---- ----- ----- -----
ANTERO RESERVOIR INFLOW           APR-JUL 14.4   99  17.7  11.1  14.5
                                  APR-SEP 16.8   94    21  12.7  17.8
                                  MAY-JUL 13.4  102  16.9   9.9  13.1
                                  MAY-SEP 15.8   96  19.8  11.8  16.4
SPINNEY MOUNTAIN RES INFLOW (2)   APR-JUL   51  106    65    39    48
                                  APR-SEP   64  105    82    49    61
                                  MAY-JUL   47  107    61    35    44
                                  MAY-SEP   60  107    78    45    56
ELEVENMILE CANYON RES INFLOW (2)  APR-JUL   50  100    64    38    50
                                  APR-SEP   64  100    82    48    64
                                  MAY-JUL   47  104    61    35    45
                                  MAY-SEP   61  105    79    45    58
CHEESMAN LAKE INFLOW (2)          APR-JUL   93   93   114    72   100
                                  APR-SEP  117   93   168    76   126
                                  MAY-JUL   82   95   103    61    86
                                  MAY-SEP  106   94   137    75   113
SOUTH PLATTE R AT S PLATTE (2)    APR-JUL  159   88   210   108   180
                                  APR-SEP  200   89   265   136   225
                                  MAY-JUL  138   88   189    87   156
                                  MAY-SEP  179   87   245   115   205
BEAR CK AB EVERGREEN              APR-JUL 14.0   85    21   8.8  16.4
                                  APR-SEP 19.1   91    30  11.6    21
                                  MAY-JUL 12.0   85  19.3   6.8  14.2
                                  MAY-SEP 17.1   90    28   9.6  18.9
CLEAR CK AT GOLDEN                APR-JUL   93   89   110    78   105
                                  APR-SEP  115   90   138    95   128
                                  MAY-JUL   86   86   105    67   100
                                  MAY-SEP  108   88   134    82   123
ST. VRAIN CK AT LYONS (2)         APR-JUL   88  100   104    73    88
                                  APR-SEP  102   99   123    83   103
                                  MAY-JUL   78   98    94    62    80
                                  MAY-SEP   92   97   112    72    95
BOULDER CK NR ORODELL (2)         APR-JUL   54  100    62    46    54
                                  APR-SEP   62   98    74    52    63
                                  MAY-JUL   49   96    57    41    51
                                  MAY-SEP   58   98    68    47    59
S BOULDER CK NR ELDORADO SPRS (2) APR-JUL   38   97    45    31    39
                                  APR-SEP   42   98    51    34    43
                                  MAY-JUL   34   97    41    27    35
                                  MAY-SEP   38   97    47    30    39
BIG THOMPSON R AT CANYON MTH (2)  APR-JUL   86   96   101    71    90
                                  APR-SEP  103   96   124    81   107
                                  MAY-JUL   78   92    94    62    85
                                  MAY-SEP   95   93   116    73   102
CACHE LA POUDRE AT CANYON MTH (2) APR-JUL  210   93   250   168   225
                                  APR-SEP  230   92   280   182   250
                                  MAY-JUL  178   85   220   136   210
                                  MAY-SEP  200   85   250   150   235


 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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