McNary Dam’s potable water system completed

Construction of McNary Lock and Dam’s new potable water distribution system was completed and put into service on Nov. 20.
The old water tank (Top) was demolished.
The nearly year-long construction effort replaced McNary’s original potable water distribution system, located on the southern shoreline of the Columbia River, just east of the City of Umatilla, Ore., which had been in use for more than 50 years.
As the old system neared the end of its design-life, pipes and valves deteriorated, pressure capability decreased, and it no longer met the dam’s fire-protection water supply, irrigation water system and other operational requirements.
Work to build the new water system began in January and included extensive planning to meet current construction-design standards.
About half of the 22-foot-tall new concrete water tank was buried below ground and an earthen berm placed on three sides, up against the tank, to present a lower water tank profile and more aesthetically pleasing and natural view to nearby homeowners.

 Construction of McNary Lock and Dam’s new potable water distribution system was completed and put into service on  Nov. 20. Photo by Terry Zerb

Construction of McNary Lock and Dam’s new potable water distribution system was completed and put into service on Nov. 20. Photo by Terry Zerb

 Construction of McNary Lock and Dam’s new potable water distribution system was completed and put into service on  Nov. 20. Photo by Terry Zerb

Construction of McNary Lock and Dam’s new potable water distribution system was completed and put into service on Nov. 20. Photo by Terry Zerb

 Construction of McNary Lock and Dam’s new potable water distribution system was completed and put into service on  Nov. 20. Photo by Terry Zerb

Construction of McNary Lock and Dam’s new potable water distribution system was completed and put into service on Nov. 20. Photo by Terry Zerb

About wallawalla