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Island County > Public Works > Cultus Bay Slide

Cultus Bay Road Slide Update

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In late March 2017, a slide occurred next to Cultus Bay Road, south of Blue Heron Way.

Because the slide was close to the southbound travel lane, Public Works took the precaution of temporarily closing the southbound lane for about 200 feet.  

A geotechnical consultant was hired to help with evaluation of the slide and design of a road shoulder repair.  In April, Island County staff used specialized equipment to provide information about the soil layers under the road, such as depth and type of soil for each layer.

The geotechnical consultant used this information to develop a shoulder stabilzation design that was best suited for this area. The design was recently completed and the materials have been ordered for the repair.

Work is expected to start the week of June 12-16 to temporarily move the current travel lane to the east 6 feet to provide area for construction of the repair.  The repair work will involve the following:

· Excavating the water-side lane down about 12 feet, to 'suitable' material - soils that will support the repair.

· Using an excavator to hammer in long spiral nails below that level to help stabilize the area and provide added drainage.

· Installing five layers of interlaced wire baskets filled with rocks.  In this case a Hilfiker wall, similar to the picture below.

· Placing a base course and top course of gravel.

· Laying down asphalt and restriping for two travel lanes.

· Removing the temporary traffic lane.

The work is expected to be completed by the end of August.

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If you have questions please contact:
Pete Seybert, Construction Engineer
petes@co.island.wa.us       (360) 678-7961

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