winter storms caused Holder Creek to erode the embankment under SR 18 near the Tiger Mountain summit (milepost 22.3). This left the shoulder cracked and the roadside vulnerable to damage from additional flooding. We stabilized the hillside by building a large rock and gravel wall, known as a rock buttress.
The new rock buttress will stabilize the hillside under the roadway and reduce the risk of the roadway cracking or sinking.
| Economic Incentive
The rock buttress will help prevent further damage to the roadway, eliminating the need for costly and inconvenient repairs.
Partnerships & Cooperation
We worked with contractor Tri-State Construction to complete this emergency repair project.
The project cost approximately $620,000.
Project Engineer Dave Lindberg
12277 134th Court NE, Suite 200
Redmond, WA 98052
Communications Meghan Soptich
15700 Dayton Avenue North
Seattle, WA 98133-9710
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