The Portland Water Bureau and Hoffman Construction Company crews continue to make steady progress in constructing the new 25-million-gallon underground reservoir, access roads, detention pond and overflow basin, and an intricate network of underground piping, multiple vaults, and valve structures at Kelly Butte in southeast Portland. Crews have completed construction on the new reservoir, including the 400-foot by 300-foot floor and roof, 252 supporting columns, and five walls (four sides, one divider wall).
Over the next couple months, crews will focus their efforts to:
Install staff gauges to provide a quick visual indication of the water’s surface level inside each reservoir cell.
Perform water-proof testing on each cell inside the reservoir.
Disinfect and test the reservoir before final filling and connecting it into the potable water system.
Backfill around the sides of the reservoir.
The entire project is on-track for completion in summer 2015.