I thought about something like although homeland security is watching me from the dam.
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FYI... My camera has been to the bottom! :yikes:
My guess is its an intake structure from the old hydros that used to be there. The bolts on the top probably held the screens. It probably isn't very deep because the intake pipes/ducts are probably pretty close to the bottom of the lake.
But that's just a guess.
It's so deep I lost the wifi signal on the GoPro. The video is sweet from what I could see.
Folsom had a hydro back in the late 1800's. One of the first ever. That looks like some pretty old shit to me. Gotta be what it is.