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
![](https://cdn.kingcounty.gov/-/media/king-county/depts/dnrp/waste-services/wastewater-treatment/capital-projects/completed/henderson/hidden-lake-pump-station-replacement-and-sewer-improvement-2009_page_2.jpg?h=501&w=679&rev=597fad5b2d474c2d93774b4a89ed86ba&hash=F51DB445CFD19145374EAFB43636A79B)
View photos on our Flickr site.