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

1400

118

142

93

1184

S. SANTIAM RIVER
Waterloo, OR

APR-SEP

670

116

153

80

576

N. SANTIAM RIVER
Mehama, OR

APR-SEP

965

116

150

82

832

WILLAMETTE RIVER
Salem, OR

APR-SEP

5460

117

136

97

4670

CLACKAMAS RIVER
Estacada, OR

APR-SEP

830

112

132

89

742

SKAGIT RIVER
Concrete nr, WA

APR-SEP

7470

114

139

90

6525

DUNGENESS RIVER
Sequim nr, WA

APR-SEP

185

121

132

110

153

COWLITZ RIVER
Mayfield Res Inflow, WA
Castle Rock, WA

APR-SEP
APR-SEP

2200
1930
3070

112
111
115

167
175
173

56
48
57

1971
1731
2668

LEWIS RIVER
Ariel, WA

APR-SEP

1430

119

179

59

1204