I-405 - Ripley Lane Stream Connection Project

Project news

Needs & benefits

There are two culverts carrying fish-bearing streams under Interstate 405 in the vicinity of Ripley Lane that have been identified as fish barriers. In addition, these two existing culverts have known maintenance issues and need to be replaced because they are at the end of their useful life. These two tributaries of Lake Washington are located near the northern border of the City of Renton, less than half a mile north of the I-405/Northeast 44th Street interchange.

The work to be completed in this project, combined with that being completed in the Renton to Bellevue project, is part of the 2013 U.S. District Court ruling requiring the state to remove fish barriers. WSDOT is addressing downstream constrictions to allow the free passage of fish as required by the court. The current stream outfalls into Lake Washington between two houses on Ripley Lane in Renton. WSDOT is working to determine the location and design for this new stream connection.

The Court has ruled that the State of Washington has built and currently operates stream culverts that block fish passage to and from the Tribes' usual and accustomed fishing places, depriving the Tribes of the fishing rights reserved in the treaties.


The project is currently in the design and environmental stages. Construction is anticipated to be complete by 2025.


This project’s preliminary engineering and right of way phases were funded with Connecting Washington funds.


I-405/SR 167 Corridor Communications

Map showing location of the Ripley Lane Stream Connection Project