Portland General Electric began operations at the hydroelectric plant in 1889. One hundred and twenty-five years later, the historic facility required seismic upgrades, including concrete and steel bracing, extensive asbestos and LBP abatement, a new ventilation system, and the replacement of all existing roofing, siding, and window glazing. All work was performed over operational hydroelectric turbines, in an occupied facility.

All work was performed over operational hydroelectric turbines in an occupied facility on top of the Willamette River Dam with water on all sides of the building.