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New guardrail in unincorporated King County.



Damaged guardrail.
Damaged guardrail will be repaired or replaced.



A tree in the traveled way at 356th Drive SE.
Tree within the traveled way on 356th Drive SE near Fall City.


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Broch Bender, Roads Communications Manager
Desk 206-263-1189

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New guardrail installation and tree removal in fall 2020

In fall 2020, King County will install new guardrail to improve driver safety in northeast and southeast King County and Vashon Island. Work takes place September through October 2020. 

Countywide guardrail vicinity map.
See a larger view - PDF 378KB

Tree and stump removal

As part of the new installation work, trees and stumps within 10-feet of the traveled way will be removed to improve safety on the following roads listed below. This is the first phase of a multiple-year program which will remove trees within the 10-foot roadway clear zone. This type of work requires crews to focus on a few trees at a time with the work moving quickly through your neighborhood.

New guardrail installation and tree removal schedule for 2020
# Road Extend/type of work Scheduled for
North King County
1 Carnation, NE 24th Street/Lake Langlois Road NE
just east of Fall City-Carnation Road
Tree and stump removal Sept. 18
Sept. 21-23
Guardrail installation Sept. 8-10
Sept. 23-25
2 Fall City, 356th Drive SE
just east of Carnation-Snoqualmie Road
Tree and stump removal Sept. 10-11
Sept. 14-17
Guardrail installation Sept. 17-18
Sept. 21-23
3 Woodinville, 232nd Ave NE
north of Trilogy
Tree and stump removal

Guardrail installation Sept. 28 – Oct. 2
4 Woodinville, Mink Road NE
just south of Woodinville-Duvall Road
Guardrail installation Oct. 5-9
5 Duvall, NE 124th Street
just east of Carnation-Duvall Road
Guardrail installation
6 Duvall, Mountain View Road NE
north of the Cherry Falls Trailhead
Guardrail installation
Guardrail installation
7 Carnation, NE Lake Joy Road
near NE Big Rock Road
Guardrail installation
Guardrail installation
8 Snoqualmie, 428th Ave SE
northeast of North Bend
Guardrail installation Sept. 10-17
South King County
9 Maple Valley, 236th Ave SE
just north of SR 18
Tree and stump removal Sept. 8-9
Guardrail installation
10 Maple Valley, Lake Francis Road SE
south of Cedar Grove Road
Guardrail installation
11 Enumclaw, SE 383rd Way and SE 380th Street
just west of SR 169
Guardrail installation

Guardrail upgrades for 2020

Later in the fall, King County Roads Services will upgrade existing guardrail in these 16 areas throughout northeast and southeast King County and Vashon Island. Work will take place October through December 2020.

The following maps display the roadways included in the 2020 Countywide Guardrail project. The work involves installation of new guardrail and the revision of existing guardrail to meet current standards.

Guardrail vicinity map for north unincorporated King County.
See a larger view of the map 332KB PDF

Guardrail vicinity map for south unincorporated King County.
See a larger view of the map 388KB PDF

Guardrail upgrade schedule for 2020
# Road Extend/type of work Scheduled for
North King County
1 148th Ave NE
NE 146th Place to NE 172nd Street
Guardrail upgrades
2 NE Cherry Valley Road, NE of Duvall Guardrail upgrades
3 West Snoqualmie Valley Road
Ames Lake Road to Sno-King County line
Guardrail upgrades
4 204th - 208th Avenue NE
SR 202 – Novelty Hill Road
Guardrail upgrades
5 NE Ames Lake Road
SR 202 to West Snoqualmie Valley Road
Guardrail upgrades
6 Cougar Mountain Drive
to Harvey Manning Trailhead
Guardrail upgrades
South King County
7 Cedar Falls Road NE
I-90 to Rattlesnake Lake
Guardrail upgrades
8 Cedar Grove Road NE
SR 169 – Issaquah-Hobart Road
Guardrail upgrades
9 164th
SR 900 – SE 128th Street
Guardrail upgrades
10 SE 216th Street
SR 169 to 276th Avenue NE/Issaquah-Ravensdale Road
Guardrail upgrades
11 Veazie-Cumberland Road
SE 416th Street to Palmer
Guardrail upgrades
12 212th Way SE
S 358th Street and Green Valley Road
Guardrail upgrades
13 SE Covington-Sawyer Road
Thomas Road SE to 215th Avenue SE
Guardrail upgrades
14 55th Avenue South
S 280th Street and S 277th Street
Guardrail upgrades
15 S 321St Street
44th Avenue S to 50th Avenue S
Guardrail upgrades

Frequently asked questions

Guardrail is designed to keep vehicles upright in the event of a crash. When a vehicle rolls over or lands on the side, injuries are likely to be more severe. Barrier systems like guardrail keep the vehicle on the shoulder and upright which leads to less severe injuries.
The county is the local government for unincorporated areas of King County. Guardrail, which saves lives and reduces serious injury, is part of an on-going roadside safety program. The King County Strategic Plan commits to safe mobility and a local government that is efficient and accountable.
Placement of guardrail is based on a number of factors including topography, the length of the need, speed, alignment, and a five-year crash history focused on run-off-road collisions. Adverse road and weather conditions are also considered.

All traffic crash and collision data is reported and stored at the Washington State Transportation Data, GIS, and Modeling Office. This office is the source for the most complete and up-to-date information regarding any location in Washington State and is the source we use for crash and collision information. For information on crashes on your roadway, submit your data request to the Transportation Data, GIS, and Modeling Office.
We will spend $930,000 for new guardrail and $3 million to modify existing guardrail to bring it up to current standards.
Please report damage to guardrail to our 24/7 Road Helpline at 206-477-8100 or toll-free at 800-527-6237, or you may email
Guardrail is installed by driving posts into the soil rather than by disturbing or removing soils. The compaction brought about by the process makes the posts more stable. In some cases where underground utilities or drainage is close to guardrail, holes are created using a large vacuum, the post is placed and the soil is compacted around it.
The County is responsible for maintenance of both the roadway and the shoulder which can include vegetation, wetland or nearby waterway. Protection can include straw mulch and logs to retain and filter water run-off.

For guardrail over rivers and streams, environmental engineers work with the Washington State Department of Fish and Wildlife to determine if there is an adverse impact. Typically, Washington State Department of Fish and Wildlife Hydraulic Project Approvals are secured for the project which include specific requirements to contain any debris.
Procurement of guardrail materials is up to the contractor(s) awarded the construction contract(s), with the exception of some end terminals which the contractor is directed to provide.