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

930

79

100

57

1184

S. SANTIAM RIVER
Waterloo, OR

APR-SEP

460

80

113

46

576

N. SANTIAM RIVER
Mehama, OR

APR-SEP

625

75

104

47

832

WILLAMETTE RIVER
Salem, OR

APR-SEP

3420

73

99

48

4670

CLACKAMAS RIVER
Estacada, OR

APR-SEP

575

77

93

60

742

SKAGIT RIVER
Concrete nr, WA

APR-SEP

4260

65

83

48

6525

DUNGENESS RIVER
Sequim nr, WA

APR-SEP

99

65

77

53

153

COWLITZ RIVER
Mayfield Res Inflow, WA
Castle Rock, WA

APR-SEP
APR-JUL
APR-SEP

1160
1020
1690

59
59
63

100
106
105

18
12
22

1971
1731
2668

LEWIS RIVER
Ariel, WA

APR-SEP

890

74

103

45

1204