The Electron Hydroelectric Project, originally known as the Puyallup Project, is a

hydroelectric Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined and ...

power plant operated by Electron Hydro LLC on the Puyallup River in Pierce County, Washington. It generates of electricity and is operated and maintained by approximately 20 full-time employees.

Location

It is located along the Puyallup River near Kapowsin, Pierce County, approximately southeast of Tacoma and southeast of Seattle in the western foothills of

Mount Rainier Mount Rainier (), indigenously known as Tahoma, Tacoma, Tacobet, or təqʷubəʔ, is a large active stratovolcano in the Cascade Range of the Pacific Northwest, located in Mount Rainier National Park about south-southeast of Seattle. With a s ...

Technology

The project, which was completed in 1904, draws water from the Puyallup River behind the Electron Diversion Dam, then funnels it to the Electron power plant via a span of wooden flume running along the side hills of the winding river valley while the river runs down a steep canyon. The wooden flume has a cross section of and can supply up to of water per second to the turbines of the Electron powerhouse. Original construction took approximately 14 months to complete. The grade is uniform and runs at seven feet of elevation per mile. A light railway line was built on top of the flume to shuttle maintenance workers and equipment. It is known as "the crookedest railway in the world," but it is not the only railway line with this claim. The flume and the railway were rebuilt in the 1940s, then again in 1985 on the original track. The original wood frames were replaced with over 12,000 steel frames, roughly on center. The flume is supported with over 6,000 bents. The flume is lined with 5.5 million board feet of fir. Electron Hydro, LLC is in the process of rebuilding the wood liner with

Alaska yellow cedar ''Callitropsis nootkatensis'', formerly known as ''Cupressus nootkatensis'' (syn. ''Xanthocyparis nootkatensis'') is a species of trees in the cypress family native to the coastal regions of northwestern North America. This species goes by many ...

and possibly coated with Polyurea. It is notable for likely being the largest flume in use for hydroelectric projects in the United States.

Fish passage facilities

The upstream migration of spawning adult salmon and

rainbow trout The rainbow trout (''Oncorhynchus mykiss'') is a species of trout native to cold-water tributaries of the Pacific Ocean in Asia and North America. The steelhead (sometimes called "steelhead trout") is an anadromous (sea-run) form of the coasta ...

is possible by a concrete, fish ladder built alongside the wooden diversion dam opposite the flume intake. Migrating juvenile fish that inadvertently enter the wooden flume downstream will be captured alive and placed back in the Puyallup River using a trap-and-haul facility, which is located in the storage reservoir’s forebay.

Controversy

On July 29, 2020, Electron Hydro, the company that owns and operates the dam, experienced an industrial accident in which crumb rubber debris was released into the Puyallup River. Astro-turf used as part of a cofferdam broke loose from the HDPE liner and was spilled into the river. The company took immediate action to rectify the spill.

References

External links

* *{{HAER , survey=WA-12 , id=wa0187 , title=Electron Hydroelectric Project, Along Puyallup River, Electron, Pierce County, WA , photos=89 , dwgs=6 , data=26 , cap=6 Historic American Engineering Record in Washington (state) Hydroelectric power companies of the United States Puyallup, Washington Light rail in Washington (state) Energy infrastructure completed in 1904 1904 establishments in Washington (state) Hydroelectric power plants in Washington (state) Puget Sound Energy Puyallup River