SR 530 - Trafton Creek and Schoolyard Creek - Fish Passage

Project news

  • Expect 5- to 10-minute delays when SR 530 is rerouted onto bypass at Schoolyard Creek east of Arlington through Sept. 3.
  • Also, expect additional 5- to 10-minute delays through mid-September between Darrington and Rockport for a separate project.
  • Sign up to receive email updates about this project and other Snohomish County area topics.

Needs & benefits

In 2019, Washington State Department of Transportation contractor crews from Kiewit will replace a culvert at Schoolyard Creek, which runs under State Route 530, between Arlington and Darrington, in Snohomish County with a larger fish culvert to improve fish passage. Work on the culvert at Trafton Creek scheduled for this summer is postponed until summer 2020.

The speed of the water through of the existing culvert for Schoolyard Creek does not allow fish to easily navigate through it. Improving this culvert will open about 2.8 miles of additional habitat for Coho salmon, steelhead and resident, bull and sea-run cutthroat trout.

Correcting fish passages is an important part of the state’s effort to protect and restore salmon runs and meet legal responsibilities. When completed, the fish passage improvements through Trafton and Schoolyard creeks will help restore the area to a natural state, improving fish passage, helping WSDOT comply with the 2013 U.S. District Court ruling that the state must remove culverts under highways that block habitat for salmon and steelhead.

What to expect

Travelers should expect traffic delays between Arlington and Darrington through Sept. 3. While the highway is closed near Schoolyard Creek, traffic will alternate through a single-lane bypass of SR 530, which will be in use 24 hours a day, seven days a week. More than 5,600 vehicles use this stretch of SR 530 each day.

Crews will place a new box culvert in Schoolyard Creek. To build the new culvert, crews must reroute the creek, excavate below the highway and move the culvert’s large concrete pieces into the work zone.

People traveling SR 530 between Darrington and Rockport also should plan for minor traffic delays for another project to reinforce the river bank along the Sauk River north of milepost 55.


Spring 2018: Project awarded to Kiewit.
May 14, 2019: Open house, 6-8 p.m. at the Darrington Community Center, 570 Sauk Ave.
May 21, 2019: Open house, 5:30-7:30 p.m. at the Church of Jesus Christ of Latter-day Saints, 8415 Arlington Heights Road.
Late spring 2019: Construction begins.
July 25, 2019: Regular SR 530 closes near Lind Road, Schoolyard Creek one-lane bypass opens
Sept. 3, 2019: Traffic returns to the regular SR 530 route at Schoolyard Creek.
July 2020: Regular SR 530 route closes near Arnot Road, Trafton Creek bypass opens
September 2020: Traffic returns to regular SR 530 route at Trafton Creek.
Fall 2020: Construction complete.


Financial Data for PIN 153026A, 153026B
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $4,667
CWA $12,951
Total $17,618


Tom Pearce

Mikkel Lamay
Project Engineer

A look at the location of Trafton and Schoolyard creeks where they run under SR 530.
A small map of the where Trafton and Schoolyard creeks run under SR 530.

A small image of the current culvert, which is a fish barrier, through Trafton Creek under SR 530.
A small image of the current culvert, which is a fish barrier, through Trafton Creek under SR 530.