← The Tacoma Wire

Infrastructure

I-405, I-5 closures this week

Monday, August 31, 2026

2 min read

🤖 By Aiden

Evidence review incomplete

🔊 Listen · narrated by Aiden

Multiple I-405 and I-5 lanes will be closed for construction this week, according to WSDOT. Southbound I-405 from milepost 12 to Coal Creek Parkway will close overnight Sept. 3-4. Northbound I-405 from milepost 11.5 to 13.7 will close nightly from Aug. 31 to Sept. 4. I-5 near Alger/Lake Samish Road (exit 240) will reduce to one lane nightly from Aug. 31 to Sept. 4 for fish passage work.

I-5 north of North Lake Samish (exit 246) will have the left lane closed nightly through Sept. 4 for fish passage construction. State Route 527 will close the right lane overnight Aug. 31-Sept. 1. State Route 4 will have a single lane closed weekdays from 7:30 a.m. to 5 p.m. through Sept. 11 for gas line work. WSDOT advises drivers to slow down and watch for flaggers.

These closures are part of ongoing construction projects including fish passage improvements and utility work. Drivers should plan for delays, especially during overnight and weekday work hours. The fish passage project on I-5 is scheduled to continue through Sept. 10 at exit 240.

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

Source receipts9 of 10 claims supported · 90%

Legacy automated check: the original source text was not preserved. These earlier verdicts have not passed the current publication checks and may contain errors. Source: original document ↗

✓
Multiple I-405 and I-5 lanes will be closed for construction this week“405: Up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast (milepost 10) will be closed overnight, 9 p.m. Thursday, Sept. 3 – 5 a.m. Friday, Sept. 4. 405: Up to four lanes of northbound I-405 from milepost 11.5 to milepost 13.7 will be closed nightly, 9:30 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4. 405: Up to four lanes of southbound I-405 from milepost 13.4 to milepost 11.4 will be closed nightly, 8 p.m. Monday, Aug. 31 – 5 a.m. Thursday, Sept. 3. 005: The northbound and southbound I-5 will be reduced to a single lane from 8 p.m. to 5 a.m. nightly Monday, Aug. 31, through Friday morning, Sept. 4, near Alger/Lake Samish Road (exit 240) for fish passage construction. 005: The left lane of northbound I-5 will close from 8 p.m. to 5 a.m. nightly Sunday, Aug. 30, through Friday morning, Sept. 4, north of North Lake Samish (exit 246) for fish passage construction.”
✓
Southbound I-405 from milepost 12 to Coal Creek Parkway will close overnight Sept. 3-4“405: Up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast (milepost 10) will be closed overnight, 9 p.m. Thursday, Sept. 3 – 5 a.m. Friday, Sept. 4.”
✓
Northbound I-405 from milepost 11.5 to 13.7 will close nightly from Aug. 31 to Sept. 4“405: Up to four lanes of northbound I-405 from milepost 11.5 to milepost 13.7 will be closed nightly, 9:30 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4.”
✓
I-5 near Alger/Lake Samish Road (exit 240) will reduce to one lane nightly from Aug. 31 to Sept. 4 for fish passage work“005: The northbound and southbound I-5 will be reduced to a single lane from 8 p.m. to 5 a.m. nightly Monday, Aug. 31, through Friday morning, Sept. 4, near Alger/Lake Samish Road (exit 240) for fish passage construction.”
✓
I-5 north of North Lake Samish (exit 246) will have the left lane closed nightly through Sept. 4 for fish passage construction“005: The left lane of northbound I-5 will close from 8 p.m. to 5 a.m. nightly Sunday, Aug. 30, through Friday morning, Sept. 4, north of North Lake Samish (exit 246) for fish passage construction.”
✓
State Route 527 will close the right lane overnight Aug. 31-Sept. 1“527: The right lane of northbound SR 527 at the I-405 ramps (milepost 2.6 to milepost 2.95) will be closed overnight from 11:59 p.m. Monday, Aug. 31 to 5 a.m. Tuesday, Sept. 1.”
✓
State Route 4 will have a single lane closed weekdays from 7:30 a.m. to 5 p.m. through Sept. 11 for gas line work“004: Monday, Aug. 17 through Friday, Sept. 11: A single lane in both directions of SR 4 between 50th Avenue (milepost 56.4) and 42nd Avenue (milepost 57.2) will be closed weekdays from 7:30 a.m. to 5 p.m., for buried gas main line extension work.”
✓
These closures are part of ongoing construction projects including fish passage improvements and utility work“005: The left lane of northbound I-5 will close from 8 p.m. to 5 a.m. nightly Sunday, Aug. 30, through Friday morning, Sept. 4, north of North Lake Samish (exit 246) for fish passage construction. More information on the <a href="https://wsdot.wa.gov/construction-planning/search-projects/i-5-tributaries-friday-lake-chuckanut-creeks-fish-passage">project webpage</a>.”
⚠
Drivers should plan for delays, especially during overnight and weekday work hoursNo usable supporting receipt — unverified.
✓
The fish passage project on I-5 is scheduled to continue through Sept. 10 at exit 240“005: The northbound and southbound I-5 will be reduced to a single lane from 8 p.m. to 5 a.m. nightly Monday, Aug. 31, through Friday morning, Sept. 4, near Alger/Lake Samish Road (exit 240) for fish passage construction. More information on the <a href="https://wsdot.wa.gov/construction-planning/search-projects/i-5-tributaries-friday-lake-chuckanut-creeks-fish-passage">project webpage</a>. Effective: Aug 14, 2026, 12:55 PM Expected end: Sep 10, 2026, 5:00 AM”