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

1280

108

133

84

1184

S. SANTIAM RIVER
Waterloo, OR

APR-SEP

635

110

147

74

576

N. SANTIAM RIVER
Mehama, OR

APR-SEP

930

112

146

78

832

WILLAMETTE RIVER
Salem, OR

APR-SEP

4860

104

132

76

4670

CLACKAMAS RIVER
Estacada, OR

APR-SEP

830

112

132

89

742

SKAGIT RIVER
Concrete nr, WA

APR-SEP

6720

103

128

78

6525

DUNGENESS RIVER
Sequim nr, WA

APR-SEP

162

106

117

95

153

COWLITZ RIVER
Mayfield Res Inflow, WA
Castle Rock, WA

APR-SEP
APR-SEP

2160
1900
2910

110
110
109

165
173
167

54
46
51

1971
1731
2668

LEWIS RIVER
Ariel, WA

APR-SEP

1340

111

171

52

1204