Saw this interesting old-school erosion control/wave dissapation in the Upper Penninsula area of Michigan on my last bridge inspeciton trip. It appreared to be recycled dock planking from the old lumber mill structures that used to line the waterfront in the area, laid a a consistent angled manner along the manmade-fill shorelines and channel banks throughout the area. Laid is multiple courses, with vegetation and gravel/sand/clay matrix holding it togetehr and infilling it rather well - seemed very stable. The timbers remain durable but flexible - ran the boat up on it at one point and they flexed rather than breaking. I bet this system has been in place for more than a half a century or more.
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