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

915

77

98

65

1184

S. SANTIAM RIVER
Waterloo, OR

APR-SEP

445

77

100

54

576

N. SANTIAM RIVER
Mehama, OR

APR-SEP

605

73

91

65

832

WILLAMETTE RIVER
Salem, OR

APR-SEP

3330

71

96

46

4670

CLACKAMAS RIVER
Estacada, OR

APR-SEP

560

75

91

59

742

SKAGIT RIVER
Concrete nr, WA

APR-SEP

4360

67

84

49

6525

DUNGENESS RIVER
Sequim nr, WA

APR-SEP

101

66

78

54

153

COWLITZ RIVER
Mayfield Res Inflow, WA
Castle Rock, WA

APR-SEP
APR-JUL
APR-SEP

1410
1240
2050

72
72
77

112
117
118

31
26
36

1971
1731
2668

LEWIS RIVER
Ariel, WA

APR-SEP

880

73

99

48

1204