Extended Streamflow Prediction
Issued by NWS Missouri Basin, Pleasant Hill

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000
FGUS63 KKRF 172110
ESPKRF

NWS MISSOURI BASIN RIVER FORECAST CENTER
WATER SUPPLY FORECAST
405 PM CDT TUE JUNE 17 2015

DISSEMINATED WITH PERMISSION OF THE
US NATURAL RESOURCES CONSERVATION SERVICE

UPPER MISSOURI BASIN

THE HIGH ELEVATION SNOW PACK IN THE UPPER MISSOURI BASIN AS OF
JUNE 1 WAS BELOW AVERAGE.  THE SNOW PACK ABOVE TOSTON,  MONTANA
WAS 52 PERCENT OF AVERAGE.  THE SNOW PACK BETWEEN TOSTON AND FORT
PECK, MONTANA WAS 33 PERCENT.  THE SNOW PACK IN THE ST MARY AND
MILK RIVER BASINS WAS 59 PERCENT.

MAY PRECIPITATION ACROSS THE UPPER MISSOURI BASIN WAS BELOW TO NEAR
AVERAGE.  BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI BASIN
INCLUDE: MILK ST. MARY,  72 PERCENT; MILK CANADA, 68 PERCENT;
LOWER MILK, 73 PERCENT; ABOVE TOSTON, 116 PERCENT; TOSTON TO
FT. PECK, 111 PERCENT.

STREAM FLOW IN THE UPPER MISSOURI BASIN IS FORECAST TO BE BELOW
AVERAGE DURING THIS SPRING AND SUMMER.  THE ST. MARY
RIVER IS FORECAST TO HAVE 56 PERCENT OF AVERAGE JUNE-SEPTEMBER
FLOWS.  RUNOFF IS EXPECTED TO RANGE AROUND 48 PERCENT OF AVERAGE
FOR THE MISSOURI BASIN ABOVE FORT PECK, MONTANA.

OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA:  LIMA RESERVOIR
HAD 104 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 86 PERCENT
OF AVERAGE WATER, GIBSON RESERVOIR HAD 110 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 106 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 115 PERCENT OF AVERAGE WATER, RESPECTIVELY.

YELLOWSTONE BASIN

THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS BELOW
AVERAGE ON JUNE 1.  THE SNOW PACK IN THE UPPER YELLOWSTONE BASIN WAS
56 PERCENT OF AVERAGE OVERALL.  THE SNOW PACKS IN THE WIND, BIGHORN,
AND SHOSHONE BASINS WERE 121, 61, AND 48 PERCENT OF AVERAGE,
RESPECTIVELY.

PRECIPITATION DURING MAY WAS ABOVE AVERAGE.  THE UPPER YELLOWSTONE
RIVER BASIN RECEIVED 131 PERCENT OF AVERAGE PRECIPITATION WHILE THE
LOWER YELLOWSTONE BASIN REPORTED 102 PERCENT OF AVERAGE.  THE
BIGHORN BASIN RECEIVED 169 PERCENT OF AVERAGE PRECIPITATION WHILE
THE WIND RIVER BASIN RECEIVED 240 PERCENT OF AVERAGE. THE LITTLE
BIGHORN - UPPER TONGUE BASIN RECEIVED 180 PERCENT OF AVERAGE AND THE
POWDER RIVER HAD 176 PERCENT OF AVERAGE PRECIPITATION.

FORECAST STREAM FLOW IN THE YELLOWSTONE BASIN IS BELOW AVERAGE
FOR THIS SPRING AND SUMMER.  STREAM FLOW FOR THE WIND-BIGHORN BASIN
ABOVE ST. XAVIER, MONTANA IS FORECAST TO BE ABOUT 80 PERCENT OF
AVERAGE.  FLOW IN THE TONGUE BASIN IS EXPECTED TO BE ABOUT 88
PERCENT OF AVERAGE.  FLOWS IN THE POWDER RIVER ARE EXPECTED TO BE
ABOUT 100 PERCENT OF AVERAGE.

MONTHEND STORAGE AT BOYSEN RESERVOIR WAS 137 PERCENT OF AVERAGE.
STORED WATER IN BUFFALO BILL RESERVOIR WAS 147 PERCENT OF AVERAGE.
MONTHEND STORAGE WAS 112 PERCENT OF AVERAGE AT BIGHORN RESERVOIR.

PLATTE BASIN

THE HIGH ELEVATION  SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
115 PERCENT OF AVERAGE ON JUNE 1.  THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 104 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 185 PERCENT OF AVERAGE.

MAY PRECIPITATION ACROSS THE PLATTE BASIN WAS ABOVE AVERAGE.
PRECIPITATION DURING MAY IN THE NORTH PLATTE BASIN ABOVE SEMINOE
RESERVOIR WAS 187 PERCENT OF AVERAGE. IN THE NORTH PLATTE BASIN
BETWEEN SEMINOE RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS
196 PERCENT OF AVERAGE. THE NORTH PLATTE BASIN BELOW GUERNSY
RESERVOIR HAD 239 PERCENT OF AVERAGE PRECIPITATION.  THE HIGH
ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 258 PERCENT OF AVERAGE
PRECIPITATION WHEREAS THE PLAINS HAD 273 PERCENT OF AVERAGE MAY
PRECIPITATION.

STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO BE BELOW TO NEAR
AVERAGE DURING THIS SPRING AND SUMMER. RUNOFF FOR STREAMS
ABOVE SEMINOE RESERVOIR ARE EXPECTED TO BE NEAR 75 PERCENT
OF AVERAGE.  STREAM FLOWS FOR THE NORTH PLATTE BELOW SEMINOE
RESERVOIR ARE FORECAST TO BE NEAR 70 PERCENT OF AVERAGE.

STORED WATER IN THE SOUTH PLATTE BASIN WAS 114 PERCENT OF AVERAGE
ON JUNE 1.  STORED WATER IN THE NORTH PLATTE BASIN WAS 120
PERCENT OF AVERAGE

DATA CURRENT AS OF JUNE 04 2015
BASED ON JUNE 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)            JUN-JUL  132   56   183    81   235
                                  JUN-SEP  171   58   230   114   295
LIMA RESERVOIR INFLOW (2)         JUN-JUL  6.1   20  19.8  0.58    31
                                  JUN-SEP  6.8   17    24  1.00    39
CLARK CANYON RESERVOIR INFLOW (2) JUN-JUL  8.2   23    52   -36    35
                                  JUN-SEP   24   44    74   -26    55
BEAVERHEAD R AT BARRETTS (2)      JUN-JUL   22   45    86   -42    49
                                  JUN-SEP   45   60   128   -38    75
BIG HOLE R NR MELROSE             JUN-JUL  187   69   300    75   270
                                  JUN-SEP  225   71   365    91   315
RUBY R RESERVOIR INFLOW (2)       JUN-JUL   21   51    36   6.1    41
                                  JUN-SEP   32   57    50  14.5    56
HEBGEN RESERVOIR INFLOW (2)       JUN-JUL   79   44   122    36   178
                                  JUN-SEP  147   53   199    95   280
ENNIS RESERVOIR INFLOW (2)        JUN-JUL  149   45   215    82   330
                                  JUN-SEP  255   53   335   169   485
GALLATIN R NR GATEWAY             JUN-JUL  140   55   198    82   255
                                  JUN-SEP  189   59   260   118   320
GALLATIN R AT LOGAN               JUN-JUL  124   51   215    35   245
                                  JUN-SEP  170   55   285    53   310
MISSOURI R AT TOSTON (2)          JUN-JUL  390   41   760    23   940
                                  JUN-SEP  570   47  1080    65  1220
MISSOURI R AT FORT BENTON (2)     JUN-JUL  600   43  1200   5.0  1410
                                  JUN-SEP  950   50  1740   165  1900
MISSOURI R NR VIRGELLE (2)        JUN-JUL  670   42  1310    33  1600
                                  JUN-SEP 1010   48  1830   186  2120
MISSOURI R NR LANDUSKY (2)        JUN-JUL  685   40  1320    51  1710
                                  JUN-SEP 1060   47  1900   220  2260
MISSOURI R BLW FT PECK DAM (2)    JUN-JUL  580   34  1370   230  1710
                                  JUN-SEP  800   37  1950   320  2170
LAKE SAKAKAWEA INFLOW (2)         JUN-JUL 3030   60  4960  1100  5060
                                  JUN-SEP 3710   60  6560   855  6150
SHEEP CK NR WHITE SULPHUR SPRINGS JUN-JUL  6.2   77   9.9   2.5   8.1
                                  JUN-SEP  8.6   79  13.6   3.6  10.9
GIBSON RESERVOIR INFLOW (2)       JUN-JUL  122   58   176    68   210
                                  JUN-SEP  163   65   220   105   250
MARIAS R NR SHELBY (2)            JUN-JUL   24   17   134   -30   143
                                  JUN-SEP   25   16   150   -30   158
NF MUSSELSHELL R NR DELPINE       JUN-JUL 1.60   80   4.4  0.20   2.0
                                  JUN-SEP  2.4   86   4.8  0.40   2.8
SF MUSSELSHELL R AB MARTINSDALE   JUN-JUL  9.6   48    28  0.50    20
                                  JUN-SEP 12.7   55    33  1.00    23
MUSSELSHELL R AT HARLOWTON (2)    JUN-JUL 15.2   54    59  -9.0    28
                                  JUN-SEP   20   67    65  -7.0    30
MILK R AT WESTERN CROSSING        JUN-JUL  4.5   71    24 0.100   6.3
                                  JUN-SEP  5.7   80    28  0.20   7.1
YELLOWSTONE R AT YELLOWSTONE LAKE JUN-JUL  230   49   305   153   465
                                  JUN-SEP  320   49   430   210   655
YELLOWSTONE R AT CORWIN SPRINGS   JUN-JUL  655   63   860   450  1040
                                  JUN-SEP  855   64  1130   580  1330
YELLOWSTONE R AT LIVINGSTON       JUN-JUL  755   64  1000   505  1180
                                  JUN-SEP  990   65  1320   665  1520
YELLOWSTONE R AT BILLINGS         JUN-JUL 1550   71  2120   975  2170
                                  JUN-SEP 1900   71  2680  1130  2660
YELLOWSTONE R AT MILES CITY (2)   JUN-JUL 2400   75  3280  1520  3200
                                  JUN-SEP 2900   75  4140  1650  3870
YELLOWSTONE R NR SIDNEY (2)       JUN-JUL 2420   75  3460  1390  3240
                                  JUN-SEP 2840   74  4300  1380  3840
BOULDER R AT BIG TIMBER           JUN-JUL  148   74   194   102   200
                                  JUN-SEP  163   72   220   106   225
STILLWATER R NR ABSAROKEE (2)     JUN-JUL  295   91   355   230   325
                                  JUN-SEP  365   91   455   275   400
CLARKS FK YELLOWSTONE R NR BELFRY JUN-JUL  300   86   365   235   350
                                  JUN-SEP  330   84   410   245   395
BOYSEN RESERVOIR INFLOW (2)       JUN-JUL  320   75   505   135   425
                                  JUN-SEP  375   77   600   145   485
BIGHORN R AT KANE (2)             JUN-JUL  460   81   700   220   570
                                  JUN-SEP  515   82   815   210   630
BIGHORN R NR ST. XAVIER (2)       JUN-JUL  730   79  1040   420   920
                                  JUN-SEP  810   80  1210   405  1010
GREYBULL R NR MEETEETSE           JUN-JUL   95   99   120    70    96
                                  JUN-SEP  141   99   174   108   142
SHELL CK NR SHELL                 JUN-JUL   34   97    43    24    35
                                  JUN-SEP   45   98    57    34    46
BUFFALO BILL RESERVOIR INFLOW (2) JUN-JUL  380   82   485   275   465
                                  JUN-SEP  455   85   585   325   535
LITTLE BIGHORN R NR HARDIN        JUN-JUL   49   92    77  19.9    53
                                  JUN-SEP   60   91    94    26    66
TONGUE R NR DAYTON (2)            JUN-JUL   43   88    59    27    49
                                  JUN-SEP   55   89    74    36    62
TONGUE RIVER RESERVOIR INFLOW (2) JUN-JUL   97   88   142    53   110
                                  JUN-SEP  118   88   174    63   134
ROCK CK NR BUFFALO                JUN-JUL 12.1  107  16.4   7.8  11.3
                                  JUN-SEP 16.2  108    21  11.1  15.0
NF POWDER R NR HAZELTON           JUN-JUL  4.9  109   7.1   2.7   4.5
                                  JUN-SEP  5.7  110   8.1   3.3   5.2
POWDER R AT MOORHEAD              JUN-JUL   91   99   145    37    92
                                  JUN-SEP  114  104   180    48   110
POWDER R NR LOCATE                JUN-JUL  101  100   173    30   101
                                  JUN-SEP  127  104   215    36   122


UPPER NORTH PLATTE RIVER BASIN
                                          50%  % OF  MAX   MIN  30-YR
FORECAST POINT                    PERIOD (KAF)  AVG (KAF) (KAF)  AVG
--------------                    ------ ----- ---- ----- ----- -----
NORTH PLATTE R NR NORTHGATE       JUN-JUL   82   67   126    38   123
                                  JUN-SEP   98   67   152    44   146
ENCAMPMENT R NR ENCAMPMENT        JUN-JUL   44   59    69  19.3    75
                                  JUN-SEP   51   61    77    24    84
ROCK CK NR ARLINGTON              JUN-JUL   34  106    41    27    32
                                  JUN-SEP   36  103    44    28    35
SEMINOE RESERVOIR INFLOW (2)      JUN-JUL  295   76   440   151   390
                                  JUN-SEP  330   74   510   157   445


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            JUN-JUL 19.1   73    31   7.3    26
                                  JUN-SEP   23   74    37   8.7    31
LA PRELE CK AB LA PRELE RESERVOIR JUN-JUL  2.7   60   6.9  0.20   4.5
                                  JUN-SEP  3.0   63   7.1  0.20   4.8
NORTH PLATTE R BL GLENDO RES (2)  JUN-JUL  270   72   380   158   375
                                  JUN-SEP  280   69   400   162   405
NORTH PLATTE R BL GUERNSEY RES (2)JUN-JUL  285   77   420   151   370
                                  JUN-SEP  310   78   455   164   400
LARAMIE R NR WOODS                JUN-JUL   51   72    73    29    71
                                  JUN-SEP   60   73    85    35    82
LITTLE LARAMIE R NR FILMORE       JUN-JUL   29   83    38  19.4    35
                                  JUN-SEP   32   82    43    22    39


SOUTH PLATTE RIVER BASIN
                                          50%  % OF  MAX   MIN  30-YR
FORECAST POINT                    PERIOD (KAF)  AVG (KAF) (KAF)  AVG
--------------                    ------ ----- ---- ----- ----- -----
ANTERO RESERVOIR INFLOW           APR-JUL   22  152    25  19.9  14.5
                                  APR-SEP   27  152    31    24  17.8
                                  JUN-JUL 15.9  159  18.3  13.5  10.0
                                  JUN-SEP   21  159    25  17.7  13.2
SPINNEY MOUNTAIN RES INFLOW (2)   APR-JUL   76  158    97    58    48
                                  APR-SEP   96  157   127    70    61
                                  JUN-JUL   58  171    79    40    34
                                  JUN-SEP   78  170   109    52    46
ELEVENMILE CANYON RES INFLOW (2)  APR-JUL   79  158   100    61    50
                                  APR-SEP  101  158   134    74    64
                                  JUN-JUL   58  166    79    40    35
                                  JUN-SEP   80  167   113    53    48
CHEESMAN LAKE INFLOW (2)          APR-JUL  167  167   205   134   100
                                  APR-SEP  210  167   275   160   126
                                  JUN-JUL  101  166   140    68    61
                                  JUN-SEP  146  166   210    94    88
SOUTH PLATTE R AT SOUTH PLATTE (2)APR-JUL  300  167   360   245   180
                                  APR-SEP  380  169   475   295   225
                                  JUN-JUL  168  158   230   115   106
                                  JUN-SEP  250  163   345   165   153
BEAR CK AB EVERGREEN              APR-JUL   35  213    42    30  16.4
                                  APR-SEP   44  210    53    37    21
                                  JUN-JUL 15.9  181    22  10.9   8.8
                                  JUN-SEP   24  178    33  17.2  13.5
CLEAR CK AT GOLDEN                APR-JUL  136  130   160   114   105
                                  APR-SEP  171  134   205   140   128
                                  JUN-JUL   95  125   119    73    76
                                  JUN-SEP  130  130   165    99   100
ST. VRAIN CK AT LYONS (2)         APR-JUL  115  131   130   102    88
                                  APR-SEP  133  129   153   115   103
                                  JUN-JUL   68  117    83    55    58
                                  JUN-SEP   86  118   106    68    73
BOULDER CK NR ORODELL (2)         APR-JUL   60  111    68    52    54
                                  APR-SEP   70  111    80    60    63
                                  JUN-JUL   45  125    53    38    36
                                  JUN-SEP   56  124    66    46    45
S BOULDER CK NR ELDORADO SPRGS(2) APR-JUL   53  136    68    41    39
                                  APR-SEP   58  135    77    43    43
                                  JUN-JUL   31  135    46  18.9    23
                                  JUN-SEP   36  133    55    21    27
BIG THOMPSON R AT CANYON MTH (2)  APR-JUL  128  142   146   112    90
                                  APR-SEP  149  139   174   127   107
                                  JUN-JUL   78  124    96    62    63
                                  JUN-SEP   99  124   124    77    80
CACHE LA POUDRE AT CANYON MTH (2) APR-JUL  335  149   390   290   225
                                  APR-SEP  360  144   430   310   250
                                  JUN-JUL  172  120   230   128   143
                                  JUN-SEP  200  121   265   145   165

 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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