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

1000

84

105

63

1184

S. SANTIAM RIVER
Waterloo, OR

APR-SEP

480

83

110

57

576

N. SANTIAM RIVER
Mehama, OR

APR-SEP

780

94

115

73

832

WILLAMETTE RIVER
Salem, OR

APR-SEP

4060

87

102

71

4670

CLACKAMAS RIVER
Estacada, OR

APR-SEP

740

100

115

82

742

SKAGIT RIVER
Concrete nr, WA

APR-SEP

5850

90

109

70

6525

DUNGENESS RIVER
Sequim nr, WA

APR-SEP

147

96

108

84

153

COWLITZ RIVER
Mayfield Res Inflow, WA
Castle Rock, WA

APR-SEP
APR-SEP

1850
1630
2520

94
94
94

138
144
139

50
44
49

1971
1731
2668

LEWIS RIVER
Ariel, WA

APR-SEP

1070

89

123

56

1204