The Oak Grove Hydroelectric Project is a 44 megawatt hydroelectric plant operated by Portland General Electric (PGE) on the Oak Grove Fork Clackamas River. Water for this project is held by three lakes, built between 1923 and 1956. PGE power plant capacity The dam creates the impoundment Lake Harriet.
History In 1907, the Southern Pacific Company began to acquire water rights for the Oak Grove fork. FWS: Eagle Creek: Appendix B: history These rights were transferred in 1911 to the Portland Railway, Light and Power Company, which later became PGE.
In 1923, the concrete diversion dam at Lake Harriet was completed. This lake holds with a surface area of . Photo tour: Harriet Dam A pipeline goes downstream from Lake Harriet to the powerhouse. Power generation from the Oak Grove fork began in August 1924.Electrifying Eden: Craig Wollner, p 111
In 1953, Frog Lake was completed, adding of storage with of surface, which was later reduced to on in 1997. Finally, in 1956, the compacted-earth dam for Timothy Lake was completed, creating the largest lake in the system at and . The Oak Grove Powerhouse contains two Francis turbines.
References
External links
USGS flow data at Oak Grove powerplant intake DEQ survey PGE: parks on the Clackamas River BPA: Oak Grove Habitat Improvement Project, 1988