I believe you are correct

I was in sandals or barefoot. I spent a lot of time there in the mid 90's Thats a great kayaking spot when the water is coming out of the power house just up stream from your picture. Its been 25 years since ive been there though

Im not sure what kind but there were a bunch of them in the rocks on the river right side.

Snakiest place on earth in the summer time. Awesome place though