Dam Name : Merwin
NPDP ID : WA00149

NPDP IDWA00149
Dam NameMerwin
Other Dam Name 
Year of Completion1931
State ID00935-01-01
Is in NIDYes
Is in OperationYes
Longitude-122.48
Latitude45.99
StateWA
CountyClark
Town SectionT6N,R2E,S33 & 34,WM
RiverLewis R
Owner NamePacificorp
Owner TypePrivate
Dam TypesArch Gravity Concrete
NID CoreHomogenous dam; Concrete; Known;
Crest Length1250
Dam NID Height313
Structral Height 
Hydraulic Height 
Dam Volume 
NID TypeRock
Max Storage Capacity422000
Normal Storage Capacity422000
NID Storage Capacity422000
Surface Area3921
Drainage Area731
Primary PurposeHydroelectric
Secondary PurposeRecreation
Hazard ClassificationHigh
EAPYes
Is State RegulatedNo
State Regulatory Agency 
Federal Regulatory AgencyDOE FERC