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

1080

91

116

67

1184

S. SANTIAM RIVER
Waterloo, OR

APR-SEP

550

95

132

59

576

N. SANTIAM RIVER
Mehama, OR

APR-SEP

810

97

133

62

832

WILLAMETTE RIVER
Salem, OR

APR-SEP

4460

96

123

68

4670

CLACKAMAS RIVER
Estacada, OR

APR-SEP

710

96

119

70

742

SKAGIT RIVER
Concrete nr, WA

APR-SEP

5270

81

111

50

6525

DUNGENESS RIVER
Sequim nr, WA

APR-SEP

135

88

115

61

153

COWLITZ RIVER
Mayfield Res Inflow, WA
Castle Rock, WA

APR-SEP
APR-JUL
APR-SEP

1590
1400
2160

81
81
81

150
160
152

11
2
10

1971
1731
2668

LEWIS RIVER
Ariel, WA

APR-SEP

1010

84

162

6

1204