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

12500
12100
25600
24500
44200
60400
65300
68200
75100
100000
97100

96
97
97
98
102
103
104
107
108
93
98

106
107
104
105
111
114
114
116
118
102
108

86
86
90
90
92
92
94
97
97
84
89

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

7140
7710
8200
9610
17800

113
116
114
118
108

131
133
133
135
122

95
99
94
101
95

6306
6638
7207
8125
16450

DUNCAN LAKE INFLOW, BC

FEB-SEP
APR-SEP

2250
2190

98
98

113
115

82
83

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

1460
2790
4050
11800
13200

92
94
104
107
106

126
121
123
122
121

57
68
85
92
91

1595
2962
3907
11060
12460

BLACKFOOT RIVER
Bonner nr, MT

APR-SEP

910

102

135

70

892

BITTERROOT RIVER
Darby nr, MT
at Mouth, MT

APR-SEP
APR-SEP

480
1320

93
97

93
136

93
58

514
1364

N. FORK FLATHEAD RIVER
Columbia Falls nr, MT

APR-SEP

1890

105

130

79

1801

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

JAN-JUL
APR-SEP

2320
2280

104
107

123
127

85
88

2224
2124

M. FORK FLATHEAD RIVER
West Glacier nr, MT

APR-SEP

1870

107

134

80

1740

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

APR-SEP
APR-SEP

6230
7290

107
109

126
126

88
91

5825
6713