Merwin P-935

General information

Waterway  Lewis River
Current status   Active 
Type of facility Conventional Hydro
Mode of hydropower generation Reregulating
Type of permit FERC License

FERC information

FERC docket # P-935
FERC project name Merwin
Permit issued 6/21/08
Permit expiration 5/27/58

Ownership and operation

Owner PacifiCorp
Owner type Investor-Owned Utility
Year first online (conventional hydro) 1931
Transmission or distribution system owner PacifiCorp

Power and generating capacity

Number of units 4
Total capacity from hydraulic turbine-generator units within each plant 136.0 mW
Average annual net hydropower generation 510,540.1 mWH

Merwin Dam

The Merwin Project (P-935) obtained its license in combination with three other projects: Swift No. 1 (P-2111), Yale Project (P-2071), and Swift No. 2 (P-2213). Collectively, these projects have once license and are known as Lewis River Projects.

The Merwin Project is the oldest and most downstream of the Lewis River Projects. It is located on the North Fork of Lewis River in Cowlitz and Clark Counties, WA and includes a concrete arch dam 313-foot-high and 1,252 feet wide.



License Issued 06-26-2008