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Historic video documentary of the 1985 rebuild of the flume for the Electron Hydro Facility
Located about 25 miles southeast of Tacoma in the western foothills of Mount Rainier, the Electron Hydroelectric Project has a 22-megawatt generating capacity. Completed in 1904, the project draws water from the Puyallup River, then funnels it to the Electron power plant via a 10-mile span of wooden flume running through the winding river valley. A small rail line that sits atop the flume to shuttle maintenance workers and equipment is known as "the crookedest railway in the world."
More info here: pse.com/inyourcommunity/pierce/Pages/Electron-Hydro.aspx