Stream and Station

Most
Probable
Forecast
(1000 AF)

Most
Probable
Forecast
(% of Avg)

Reasonable
Maximum
(% of Avg)

Reasonable
Minimum
(% of Avg)

30 Year
(1971 - 2000)
Avg Runoff
(1000 AF)

COLUMBIA RIVER
Mica Reservoir Inflow, BC

Arrow Lakes Inflow, BC

Birchbank, BC (1)
International Boundary, BC (1)
Grand Coulee, WA (1)

Rock Island Dam blo, WA (1)
The Dalles nr, OR (1)

FEB-SEP
APR-SEP
FEB-SEP
APR-SEP
APR-SEP
APR-SEP
JAN-JUL
APR-SEP
APR-SEP
JAN-JUL
APR-SEP

12100
11700
24800
23700
41200
55800
61100
63400
70100
96400
92800

93
94
94
94
95
95
97
99
101
90
94

103
104
101
102
107
109
111
113
114
103
107

83
83
86
86
83
81
84
86
87
77
80

12960
12500
26460
25110
43500
58820
62900
63990
69540
107300
98650

KOOTENAI RIVER
Libby Reservoir Inflow, MT (1)

Libby, MT (1)
Leonia, ID (1)
Kootenay Lake Inflow, BC

JAN-JUL
APR-SEP
APR-SEP
APR-SEP
APR-SEP

6160
6570
6960
8040
15600

98
99
97
99
95

118
119
117
118
111

77
79
76
80
79

6306
6638
7207
8125
16450

DUNCAN LAKE INFLOW, BC

FEB-SEP
APR-SEP

2230
2170

97
97

113
115

81
81

2305
2227

CLARK FORK RIVER
Missoula abv, MT
Missoula blo, MT
St. Regis, MT (1)
Plains nr, MT (1)
Whitehorse Rapids, ID (1)

APR-SEP
APR-SEP
APR-SEP
APR-SEP
APR-SEP

1360
2590
3730
10600
11900

85
87
95
96
96

108
105
123
117
117

64
69
68
76
75

1595
2962
3907
11060
12460

BLACKFOOT RIVER
Bonner nr, MT

APR-SEP

865

97

122

73

892

BITTERROOT RIVER
Darby nr, MT
at Mouth, MT

APR-SEP
APR-SEP

445
1230

87
90

111
106

67
75

514
1364

N. FORK FLATHEAD RIVER
Columbia Falls nr, MT

APR-SEP

1730

96

112

82

1801

S. FORK FLATHEAD RIVER
Hungry Horse Res in, MT (1)

JAN-JUL
APR-SEP

2110
2060

95
97

115
118

75
76

2224
2124

M. FORK FLATHEAD RIVER
West Glacier nr, MT

APR-SEP

1650

95

111

85

1740

FLATHEAD RIVER
Columbia Falls, MT
Flathead Lake Inflow, MT (1)

APR-SEP
APR-SEP

5610
6460

96
96

112
117

79
76

5825
6713