Infrastructure

SR 9 Fish Passage Work Begins, I-5 and I-405 Closures

Friday, August 21, 2026

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WSDOT announced new traffic restrictions on SR 9 near Kalloch Road (MP 59) and near Mount Vernon Big Lake Road (MP 49) for fish passage construction, effective August 21, 2026. SR 9 will operate as a single lane with alternating traffic through a bypass road until September 14.

I-5 will close three left lanes northbound from State Route 526 to Lowell Road (MP 189-191) nightly from August 24-26. I-405 will have lane closures for utilities work and pavement repair from August 21-26, with specific nighttime and weekend closures. SR 547 will alternate traffic with flaggers weekdays from August 24-September 4 for PSE utility work.

The fish passage project aims to improve salmon habitat, while utility and pavement work maintains infrastructure. Residents should expect delays during the specified times and routes. The project webpage provides additional details for travelers.

📄 Source: WSDOT — Highway Construction & Closures — https://wsdot.wa.gov/travel/road-construction

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WSDOT announced new traffic restrictions on SR 9 near Kalloch Road (MP 59)“009: SR 9 is reduced to a single lane near Kalloch Road (MP 59) with a signal alternating northbound and southbound traffic through a bypass road for 42 days, until Sept. 14 for fish passage construction. Expect delays in the area.”
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WSDOT announced new traffic restrictions on SR 9 near Mount Vernon Big Lake Road (MP 49)“009: Northbound and southbound traffic will alternate from 10 a.m. to 4 p.m. daily Mondays through Thursday through Thursday, Sept. 3, just south of Mount Vernon Big Lake Road (milepost 49) for fish passage construction. Expect delays in the area.”
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WSDOT announced new traffic restrictions for fish passage construction“009: SR 9 is reduced to a single lane near Kalloch Road (MP 59) with a signal alternating northbound and southbound traffic through a bypass road for 42 days, until Sept. 14 for fish passage construction. Expect delays in the area.”
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The traffic restrictions are effective August 21, 2026“Effective: Aug 21, 2026, 12:05 PM Effective: Aug 21, 2026, 12:43 PM Effective: Aug 21, 2026, 2:18 PM Effective: Aug 21, 2026, 12:15 PM Effective: Aug 21, 2026, 12:45 PM Effective: Aug 21, 2026, 3:11 PM Effective: Aug 21, 2026, 12:00 AM”
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SR 9 will operate as a single lane with alternating traffic through a bypass road“009: SR 9 is reduced to a single lane near Kalloch Road (MP 59) with a signal alternating northbound and southbound traffic through a bypass road for 42 days, until Sept. 14 for fish passage construction. Expect delays in the area.”
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SR 9 will operate as a single lane with alternating traffic until September 14“009: SR 9 is reduced to a single lane near Kalloch Road (MP 59) with a signal alternating northbound and southbound traffic through a bypass road for 42 days, until Sept. 14 for fish passage construction. Expect delays in the area.”
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I-5 will close three left lanes northbound from State Route 526 to Lowell Road (MP 189-191) nightly“005: Nightly from 9 p.m. to 5 a.m. the next day beginning Monday, Aug. 24 to 5 a.m. Wednesday, Aug. 26, three left lanes of northbound Interstate 5 will close from State Route 526/State Route 527 (milepost 189) to Lowell Road (milepost 191) for maintenance.”
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I-5 will close three left lanes northbound from State Route 526 to Lowell Road (MP 189-191) from August 24-26“005: Nightly from 9 p.m. to 5 a.m. the next day beginning Monday, Aug. 24 to 5 a.m. Wednesday, Aug. 26, three left lanes of northbound Interstate 5 will close from State Route 526/State Route 527 (milepost 189) to Lowell Road (milepost 191) for maintenance.”
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I-405 will have lane closures for utilities work and pavement repair“405: Nightly from 11:59 p.m. to 4 a.m. the next day beginning Monday, Aug. 24 to 4 a.m. Wednesday, Aug. 26, expect intermittent rolling slowdowns on both directions of Interstate 405 from Northeast 145th Street (milepost 21) to Coal Creek Parkway/Newport Way (milepost 10) for PSE utilities work.”
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I-405 will have lane closures from August 21-26“405: Nightly from 11:59 p.m. to 4 a.m. the next day beginning Monday, Aug. 24 to 4 a.m. Wednesday, Aug. 26, expect intermittent rolling slowdowns on both directions of Interstate 405 from Northeast 145th Street (milepost 21) to Coal Creek Parkway/Newport Way (milepost 10) for PSE utilities work.”
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SR 547 will alternate traffic with flaggers weekdays“547: Weekdays from 9 a.m. to 3 p.m. beginning Monday, Aug. 24 until noon Friday, Sept. 4, State Route 547 traffic will alternate with flaggers from State Route 542 (milepost 0) to Frost Road (milepost 6) will close for PSE utilities work.”
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SR 547 will alternate traffic with flaggers weekdays from August 24-September 4“547: Weekdays from 9 a.m. to 3 p.m. beginning Monday, Aug. 24 until noon Friday, Sept. 4, State Route 547 traffic will alternate with flaggers from State Route 542 (milepost 0) to Frost Road (milepost 6) will close for PSE utilities work.”
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SR 547 will alternate traffic with flaggers for PSE utility work“547: Weekdays from 9 a.m. to 3 p.m. beginning Monday, Aug. 24 until noon Friday, Sept. 4, State Route 547 traffic will alternate with flaggers from State Route 542 (milepost 0) to Frost Road (milepost 6) will close for PSE utilities work.”