Hidden Lake Pump Station replacement and sewer improvement

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.