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Anti-Aircraft Creek Culvert Replacement


To reduce flooding risks, the City is replacing a culvert that runs underneath Newport Way Northwest near Northwest Oakcrest Drive.

The old culvert cannot accommodate water from Anti-Aircraft Creek during major storms.

This project also improves fish passage and habitat along the creek.
Traffic Impacts
Because the culvert runs underneath Newport Way Northwest, crews will have to cut into the road to relocate utility lines and replace the culvert. 

This is a summary of expected traffic impacts, which may change (and, at times, include night and weekend hours). To receive future updates on impacts associated with this project and elsewhere in Issaquah, sign up for the City’s “Traffic Alerts” via the Notify Me tool.

Drivers are encouraged to take alternate routes.

April through June
  • Several utility companies will relocate their lines to prepare for the City’s project. 
  • Expect delays, with Newport typically reduced to one lane from 9 a.m.-3 p.m. weekdays. Flaggers will alternate traffic through the work zone, and accommodate pedestrians that need to cross.

June through August
  • Crews will work to replace the culvert. 
  • Expect delays throughout the project time frameTwo lanes of traffic will typically remain open on Newport, but the lanes will be tighter, and crews may cause delays as they enter and leave the site. Pedestrian access will be provided.

Other Impacts
During the project, vehicles, construction equipment, materials and/or signs will be located along the shoulders of Newport Way. In addition, access to the Big Tree Ridge Trailhead for vehicles and pedestrians is very limited.


City's Stormwater Utility Funds $814,000
FEMA grant $131,000 
Total $945,000 

Stay Connected
To receive more information about the public and private projects planned along Newport Way Northwest between State Route 900 and Southeast 54th Street, including traffic impacts, please sign up for regular updates.
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Issaquah Contacts
Staff Liaison
Frank Reinart
Senior Engineer