NE 148th Street Infiltration Facilities Project

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As of October 2017
Phase: Design on hold pending Washington State Department of Ecology (Ecology) grant funding

The project was selected by Ecology in 2015 to receive a $290,625 grant (funding 75% of the costs to complete this project, including construction of improvements). However, a revenue shortfall for the State’s Model Toxics Control Act (MTCA; see more information here), caused Ecology in April 2016 to indefinitely delay funding for many grants, including the grant for this project. The City is placing this project on hold until the delayed Ecology funding is available, or until alternative funding can be secured (if it is later determined that funding from Ecology is effectively unavailable). Design is approximately 95% complete, so once funding is secured the project should be construction-ready shortly thereafter.

UPDATE: The City re-applied for Ecology funding in October 2016 as recommended by Ecology grant managers in order to enhance the likelihood of obtaining funding. On January 20, 2017, Ecology published the SFY18 Draft Water Quality Funding Offer List and Intended Use Plan (Draft List), which lists projects offered funding based on the Governor’s proposed 2017-19 Biennial Budget. The draft funding list offered the full amount of grant funding previously delayed. In July 2017, the 2017 legislative session ended without passing a new 2017-19 capital budget, meaning that no grant funding is available for this project. The following excerpt from the Governor’s message provides some hope that the legislature will still come to agreement on a new capital budget:

“I hope once legislators return to their districts and hear from community leaders, school officials and constituents whose projects or programs are being disrupted, they’ll agree to return to Olympia to pass the capital budget.” – Governor Jay Inslee

Overview and History

Storm drainage infrastructure on NE 148th Street between 12th and 15th Avenues NE currently consists of a single catch basin located on the south side of the street approximately 200 feet west of 15th Avenue NE. This catch basin apparently has no outlet, dispersing inflows by infiltration alone, and is easily overwhelmed by runoff. The existing storm drainage configuration leads to frequent ponding within large areas on both sides of NE 148th Street.

 148th st

Ponding on the south side of NE 148th Street during a November 19, 2012, storm event

This project will use an innovative approach to improve drainage and reduce flooding while also protecting Little’s Creek from urban runoff. An array of low impact development (LID) stormwater facilities installed along much of the block on both sides of the street will utilize buried matrix structures as small-scale storage and infiltration facilities. Half of the facilities will include bioretention surfaces, while the other half will feature gravel or asphalt surfaces to allow continued use of shoulder parking in selected areas.

This LID stormwater approach is in lieu of a “conventional” solution to the drainage issue, such as installing several hundred feet of new stormwater pipe to connect NE 148th Street to a downstream storm drain system. Such a connection would discharge to Little’s Creek via the 15th Avenue NE storm drain and exacerbate urban runoff impacts to the creek, including increased peak flows and water quality degradation.

95% Design Preliminary Plan Sheets

Page 1 from Drawing Set 148th 2014-11-06SM
Page 1 - Click on image to view larger version

Page 2 from Drawing Set 148th 2014-11-06SM
Page 2  - Click on image to view larger version

Page 3 from Drawing Set 148th 2014-11-06SM
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