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

1350

114

114

114

1184

S. SANTIAM RIVER
Waterloo, OR

APR-SEP

625

109

109

109

576

N. SANTIAM RIVER
Mehama, OR

APR-SEP

1010

121

121

121

832

WILLAMETTE RIVER
Salem, OR

APR-SEP

5100

109

109

109

4670

CLACKAMAS RIVER
Estacada, OR

APR-SEP

920

124

124

124

742

SKAGIT RIVER
Concrete nr, WA

APR-SEP

8560

131

149

114

6525

DUNGENESS RIVER
Sequim nr, WA

APR-SEP

200

131

131

131

153

COWLITZ RIVER
Mayfield Res Inflow, WA
Castle Rock, WA

APR-SEP
APR-SEP

2460
2160
3300

125
125
124

166
172
165

84
78
82

1971
1731
2668

LEWIS RIVER
Ariel, WA

APR-SEP

1590

132

161

103

1204