A former WW2 fire control bunker at the end of Fox Point had fallen into the river sometime before the article as a result of erosion.
I included a Puget Sound Harbor Defense document showing the location of the former WW2 bunker. The bunker would've been the same simple pillbox style also seen near the camping area at Camp Hayden / Salt Creek Rec Area.
There's been recent interest from the Coastal Watershed Institute in PA to remove part of the dike to help restore the original river flow and help save struggling salmon runs. The last I heard, the Place Road neighbors had met with CWI discuss their interests. The effect of Covid-19 on things have slowed progress on this project.