Here is additional information on this project provided by Kurt Reidinger.

https://nwtreatytribes.org/building-a-new-channel-to-keep-sediment-out-of-stillaguamish-river/

We wrote about this project in June. Here is video of the completed project recorded and produced by Kanako Iwata-Eng on 19 Sept 2021.

https://gopro.com/v/WyZGbw1klE9bP