The Culvert Case was the result of the Tribes suing WA DOT over culvert barriers under state roads. State lost even though they argued that the state should be able to blow away salmon runs for the public good.

State and tribes settled on a plan but the state has drug its feet until recently when the decline loomed and lots still needed doing and costs are escalating.

The Culvert Case work is funded by WA. Other replacements have other funding sources.

There was a great series of articles in the Seattle Times about the foster cluck this has become. The state has removed barriers (Yay!!!) upstream of other barriers not yet planned for removal by others.

I seriously doubt oil much monitoring has been or will be done beyond an estimate pre-project of how many feet of blocked habitat are opened.

Should be noted that most of the culverts are on smaller streams that are used by coho, chum, steelhead, and cutthroat. Not much to help Chinook because the barriers that block them are dams.