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
24900
23800
41900
57300
62300
64700
71700
98200
95100

93
94
94
95
96
97
99
101
103
92
96

103
104
102
103
107
109
110
112
114
102
107

83
83
87
87
86
85
88
91
92
81
85

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

6310
6750
7160
8240
16200

100
102
99
101
98

119
120
119
120
112

81
84
80
83
84

6306
6638
7207
8125
16450

DUNCAN LAKE INFLOW, BC

FEB-SEP
APR-SEP

2220
2160

96
97

112
113

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

1480
2750
3890
11200
12500

93
93
100
101
100

129
119
123
118
119

57
66
77
84
82

1595
2962
3907
11060
12460

BLACKFOOT RIVER
Bonner nr, MT

APR-SEP

910

102

136

69

892

BITTERROOT RIVER
Darby nr, MT
at Mouth, MT

APR-SEP
APR-SEP

460
1260

89
92

89
133

89
52

514
1364

N. FORK FLATHEAD RIVER
Columbia Falls nr, MT

APR-SEP

1850

103

130

75

1801

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

JAN-JUL
APR-SEP

2220
2180

100
103

119
123

80
82

2224
2124

M. FORK FLATHEAD RIVER
West Glacier nr, MT

APR-SEP

1780

102

130

74

1740

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

APR-SEP
APR-SEP

5990
6980

103
104

122
123

84
85

5825
6713