Humpback Creek
Hydroelectric Project Features

General: This is a run of the river project roughly 7 miles north of the Cordova boat harbor that consists of: (1) a diversion dam and intake structure; (2) a flume and pipeline power conduit conveying water approximately 2,000 ft.; (3) a power house containing two 600 KW and one 300 KW generating units for a total installed capacity of 1.5 MW; (4) a 5.1 mile buried and underwater transmission line and is presently accessible only by boat.

Diversion Dam and Intake Structure: The diversion dam is a wood and steel structure 13 feet high with a crest length of close to 50 feet with a steel gate for sluicing sediment and debris. The intake structure is approximately 5 feet high by18 feet wide with a trash rack across the entire face.

 

Power Conduit: The power conduit is a short wooden flume that leads to a dry-shack and a 42 inch diameter pipeline 2000 feet long that drops 200 feet in elevation, ending in the powerhouse.

Powerhouse: At the powerhouse a steel manifold distributes the water flow to two Francis turbines turning Kato Engineering generators rated for 500 KW each at 1200 RPM and one Turgo pelton turning a Kato Engineering generator rated for 250 KW at 600 RPM.

Transmission Line: The transmission line consists of 15,000 feet of 25 kV submarine line running from the powerhouse out into Orca Inlet of Prince William Sound to the end of Orca Road and another 12,000 feet of buried 15 kV line that ends at the Orca Power plant where it ties into CEC's distribution system.

Access: Currently, the only access to the project is by boat, however a new road out to Shepard Point is expected in the next couple of years that will run right past the project, allowing vehicle access for the first time since it was commissioned in June of 1990.