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

1270

107

127

80

1184

S. SANTIAM RIVER
Waterloo, OR

APR-SEP

650

113

145

75

576

N. SANTIAM RIVER
Mehama, OR

APR-SEP

960

115

150

80

832

WILLAMETTE RIVER
Salem, OR

APR-SEP

5280

113

145

75

4670

CLACKAMAS RIVER
Estacada, OR

APR-SEP

840

113

136

88

742

SKAGIT RIVER
Concrete nr, WA

APR-SEP

6260

96

126

66

6525

DUNGENESS RIVER
Sequim nr, WA

APR-SEP

163

107

134

80

153

COWLITZ RIVER
Mayfield Res Inflow, WA
Castle Rock, WA

APR-SEP
APR-JUL
APR-SEP

1870
1640
2530

95
95
95

164
174
166

26
16
24

1971
1731
2668

LEWIS RIVER
Ariel, WA

APR-SEP

1200

100

177

22

1204