Along the water's edge of Upper Hoh Road and Hoh Valley Road, you'll notice concrete structures with large tree trunks and branches "inserted" in a seemingly haphazard manner. These are held in place with beefy metal chain links.
We learned these structures are called "dolos" and weigh about 8-tons when combined with logs to create Engineered Log Jams that will protect the road from the river. The National Park Service would not build a road so close to such a river if these decisions were being made today.
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