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Hidden Lake Pump Station replacement and sewer improvement

Completed – Spring 2009

What King County built

  • New underground storage pipe
    • A 500,000-gallon underground storage pipe that temporarily stores wastewater during large storms
    • Underground odor and flow control structures
    • About 1,000 ft of sewer pipe replaced in the streets around the park
    • Additional capacity added to the city’s stormwater detention pond
  • Boeing Creek Trunk Sewer replacement
    • Replaced about 1,200 ft of Ronald Wastewater District sewer pipe
    • Replaced about 12,000 ft of county sewer pipe
    • Replaced about 6,500 ft of water mains for Seattle Public Utilities
    • Repaved streets and widened asphalt shoulder in some areas
  • Pump station replacement
    • A new Hidden Lake Pump Station, with pumping capacity of 6.8 mgd
    • A cost-effective design that helps the building blend in with the neighborhood
    • In winter 2008, landscaping with mostly native plants completed

Project schedule

  • Construction began: summer 2006
  • Construction complete:
    • Underground storage tank in Boeing Creek Park – Fall 2007
    • Boeing Creek Trunk – Summer 2008
    • Hidden Lake Pump Station – Spring 2009

Project map

View photos on our Flickr site.