SR 522 Drainage Improvement
Completed 2016
Budget: Surface Water Component: $633,500
The SR 522 Corridor Improvements were completed in multiple phases and stages. The ultimate goal of the entire SR 522 project was to increase safety along SR 522 and improve capacity for vehicles, pedestrians, and cyclists. During the project, all of the drainage was improved as well. Many new flow control and water quality facilities were added to greatly improve the water entering Lake Washington and Sammamish River.
NE 192nd Street Culvert Replacement
2014-2017
Budget: $317,000
This project will remove an existing culvert and replace it with a new fish-passable box culvert to eliminate flooding caused by Little Swamp Creek at NE 192nd Street.
NE 181st Street Culvert Replacement
2008-2012
Budget: $817,600
In May 2008, a sinkhole developed in the NE 181st St roadway over the Tributary 0056 culvert crossing. Due to the structural deterioration of the culvert, an emergency permit was issued and the culvert was replaced with a fish-passable box culvert.
NE 170th Street Culvert Replacement/Tributary 0057 Channel Relocation
Tributary 0057 Sediment Study & Channel Relocation Project
Tributary 0057 Sediment Report
City Council and Open House Presentation - May 2010
2011-2013
Budget: $1,103,400
An undersized vault located 200' east of 72nd Ave NE and NE 170th St was clogged during a large storm in 2007. The storm caused a back-up of Tributary 0057 and created massive right-of-way flooding and closures. A fish-passable box-culvert was constructed and resized to accommodate flows and relocate the stream through a different conveyance system.
