Two men in safety vests stand on a dry riverbed next to rootwad anchors. Logs wrapped in chains lie next to a dry riverbank. Boulders near the trees have chains threaded through manmade holes. A chain emanates from a manmade hole in a streambed boulder. The end of the chain is wrapped around a log. Logs wrapped in chains lie next to a dry riverbank. Boulders near the trees have chains threaded through manmade holes. A black chain emerges from a hole drilled into a streambed boulder. A boulder in the background has had the chain's anchor drilled into it. Meanwhile, piles of logs wrapped in chains can be seen in the background as well. Streambed boulders sit at the edge of a riverbank stabilization project. An excavator operator gently deposits a large streambed boulder onto a rocky area with the jaws of a Deere excavator. A diverted river meanders peacefully around a bend in the river.

Mashel River Bank Stabilization

Date: 2026
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Description

A bank of the Mashel River was slowly being scoured after a repair upstream changed waterflow patterns. The erosion threatened a wastewater treatment plant in Eatonville operated by Eatonville Public Works. Work on the riverbank included "installing engineered wood structures consisting of toe logs, ballasted log rows, and ballasted engineered log jam (ELJ) structures above and below water" and "embankment reshaping including furnishing and installing gravel and cobble above and below water" (BXWA.com description).

Materials

1,500 tons of Custom Streambed Boulder Mix
150 Tons of WSDOT Class 2 Sand
60 tons of 4-Man Streambed Boulders
30 tons of 3-Man Streambed Boulders

Highlights

Washington Rock Quarries provided Super Sacks of sand to help with water diversion. We also supplied streambed boulders that were drilled by the contractor to allow logs to be lashed to the boulders with chains.

The successful completion of the project "will help prevent the city from releasing 5.8 million gallons of contaminated wastewater if flooding occurs in the treatment facility," according to The News Tribune.

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