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

1450

122

144

101

1184

S. SANTIAM RIVER
Waterloo, OR

APR-SEP

710

123

157

90

576

N. SANTIAM RIVER
Mehama, OR

APR-SEP

1060

127

157

100

832

WILLAMETTE RIVER
Salem, OR

APR-SEP

5750

123

149

98

4670

CLACKAMAS RIVER
Estacada, OR

APR-SEP

895

121

137

104

742

SKAGIT RIVER
Concrete nr, WA

APR-SEP

8820

135

155

116

6525

DUNGENESS RIVER
Sequim nr, WA

APR-SEP

210

137

149

125

153

COWLITZ RIVER
Mayfield Res Inflow, WA
Castle Rock, WA

APR-SEP
APR-SEP

2610
2290
3510

132
132
132

177
183
177

88
82
86

1971
1731
2668

LEWIS RIVER
Ariel, WA

APR-SEP

1720

143

176

110

1204