I read it on another forum guy said it about a mile from a park there's a pull off in a sharp corner on 93 wher u could see where hillside was blasted u had to cross creek above the falls then down a steep bank to get to the hole that was all it said
I grew up in logan, and fished there quite a bit when I was a kid. There were always stories of it being connected underground to a "death hole" upriver. Not sure if they were ever true. I caught some big crappie out of there back in the day. There also have been a few accidents happen with people swimming there as well.
Take SR 93 south of city limits( 1mi) First hard turn to the Lt and it is on your Rt. it may all be private prop. I know it gets hit pretty good. There is a shallow rock bottom and a pull of there that is used to get to the crop fields. The water from there dumps in to the pool.