An old culvert is being replaced with a fish-friendlier box culvert with greater flow capacity, and the streambed is being dug out, with mud being replaced with spawning-size gravel and cobble.

Whether or not salmon would get up that high to spawn is debatable, but trout certainly use the entire creek.

I was chatting with one of the workmen and he said they trapped a 10cm coho smolt way up there, when they were dewatering.