Breakwall

Signage says one must keep a minimum of 500' downstream of the dam. For reference, the end of the breakwall (alongside Fratello's and the Paper Discovery Center) is about 436' from the dam, so technically one would be legal only if they stayed another 64' downstream from that mark. That appears to correspond roughly to the downstream end of that warehouse-type building. (I.E., if you can see the NorthEast wall of the building, you're fine -- if you can't, you are technically too close to the dam.)