Just joining the discussion. Log jams are generally positive features from a fish habitat stand point. What is it that makes this jam different? I think it's important to note that what is good or desirable for navigation isn't necessarily the same as being good for fish.

Consider that in the late 1800s there was a two mile long log jam, bank to bank, on the Skagit River just above the divergence of the north and south forks and downstream of the Mt. Vernon townsite. Salmon and trout populations didn't seem to mind.

Sincerely,

Salmo g.