I hope you feel more energetic soon. Another nice set, and the weird detail is my pick. The fish ladder is something I never heard of, but I know very little about rivers and waterways.
No, I haven't, but then it's not a spot I've visited very often. According to this article in the Lancashire Telegraph, the fish ladder was installed in 2001 after a 6lb salmon was spotted by an angler while it was trying to negotiate the weir. The theory at the time suggested it was trying to return to the River Ribble to spawn, but had somehow got lost and ended up in the Yarrow instead. Apparently they sometimes see trout jumping the weir too.
I shot a few clips of video at the weir, nothing fancy, just a few static shots taken with the GFX on its tripod, but I think it conveys the power of the water much better than the still images do. It's certainly noisier.
Neither do I, but they're quite a common sight around here (Northwest England), probably because a lot of our rivers were dammed to power mills back in the 19th and 20th centuries. There's another nice example a few miles further down the Yarrow at Pincock Weir in Euxton.
This one's quite a different sort of design, taking a more leisurely route before rejoining the river some way down from the weir it bypasses. I imagine that's less stressful for the fish working their way up it.
Wow, that's one hell of a fish ladder, no wonder it's a tourist attraction of sorts. The poor fish must be exhausted by the time they get to the top of that thing.
Unfortunately, I only took one close up shot of the weir as I needed to move on and get into the woods before the sun got too high. However, I did take the wider shot of the weir at a selection of shutter speeds. These are the uncropped images taken (from left to right) at 1/25th, 1/30th and 1/6th.
I think the faster shutter speed works better for the fish ladder and the basin below the weir, capturing more of the power and energy of the water, but I quite like how the longer exposure smooths out the water coming over the weir in the third shot.