Drilling work on State Route 18 will require weekday closures of the right eastbound lane through the end of November.
The lane will be closed daily from 9 a.m. to 4 p.m. Washington State Department of Transportation drilling crews are working in approximately 2-mile sections between Issaquah/Hobart Road and the Tiger Mountain summit.
The lane will not be closed on weekends or the following holidays:
- Friday, Nov. 11 – Veterans Day
- Noon, Wednesday, Nov. 23 through noon, Monday, Nov. 28 – Thanksgiving weekend
The drilling crews are gathering information about the soil under the highway in preparation for the SR 18 Issaquah/Hobart Road to Deep Creek widening project
The $665 million project will widen the highway to two lanes in each direction between Issaquah/Hobart Road and Deep Creek, where it will connect to the wider lanes built as part of the I-90/SR 18 interchange improvements project. SR 18 widening could start construction as early as 2025 after work is completed on the interchange.