Sounds like more fish are making it this year. Cool!

I did this last year, and my smolt's journey looked a lot like this year's Fishy McFishFace run. Back and forth at the bridge multiple times, culminating in more seal scat.

It seems clear that the bridge has a significant impact. What Swifty27 said, plus, the back sides of the pontoons probably make for great ambush spots when smolts finally get up the courage to run around the bridge. Let's tear that thing down and start a new ferry route!