Stream and Station

Most
Probable
Forecast
(1000 AF)

Most
Probable
Forecast
(% of Avg)

Reasonable
Maximum
(% of Avg)

Reasonable
Minimum
(% of Avg)

30 Year
(1961-1990)
Avg Runoff
(1000 AF)

McKENZIE RIVER
Vida nr, OR

APR-SEP

2110

114

139

89

1184

S. SANTIAM RIVER
Waterloo, OR

APR-SEP

540

94

133

55

576

N. SANTIAM RIVER
Mehama, OR

APR-SEP

830

100

136

64

832

WILLAMETTE RIVER
Salem, OR

APR-SEP

4310

92

118

64

4670

CLACKAMAS RIVER
Estacada, OR

APR-SEP

805

108

124

92

742

SKAGIT RIVER
Concrete nr, WA

APR-SEP

6360

97

115

80

6525

DUNGENESS RIVER
Sequim nr, WA

APR-SEP

152

99

108

90

153

COWLITZ RIVER
Mayfield Res Inflow, WA
Castle Rock, WA

APR-SEP
APR-SEP

1980
1740
2580

100
101
97

142
147
138

60
54
55

1971
1731
2668

LEWIS RIVER
Ariel, WA

APR-SEP

1260

105

134

75

1204