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

980

83

107

58

1184

S. SANTIAM RIVER
Waterloo, OR

APR-SEP

500

87

123

51

576

N. SANTIAM RIVER
Mehama, OR

APR-SEP

730

88

121

53

832

WILLAMETTE RIVER
Salem, OR

APR-SEP

3900

84

111

56

4670

CLACKAMAS RIVER
Estacada, OR

APR-SEP

640

86

107

64

742

SKAGIT RIVER
Concrete nr, WA

APR-SEP

4680

72

97

47

6525

DUNGENESS RIVER
Sequim nr, WA

APR-SEP

107

70

81

59

153

COWLITZ RIVER
Mayfield Res Inflow, WA
Castle Rock, WA

APR-SEP
APR-JUL
APR-SEP

1460
1280
2070

74
74
78

130
137
135

18
11
19

1971
1731
2668

LEWIS RIVER
Ariel, WA

APR-SEP

940

78

138

18

1204