That massive pool restoration project

[Poconos]

Been using stream water for probably 6-7 years and no problem. I do run the chlorine up some after topping off but not to shock levels. Heck, people swim in ponds all the time. I use a small sump pump if I'm not in a hurry to fill, and run it into the skimmer with the pool pump running. This takes care of any dirt or stuff that may get sucked up. If I need a rapid fill, such as when I was chasing a 50 GPH leak, I used an old 1 HP pool pump. Then I pumped into the waste line, set the regular pool sand filter to backwash, and the filtered stream water came out the skimmer thus passing it thru the pool filter in the right direction. Obviously this assumes the stream is relatively clean and there isn't a chicken farm or something like that upstream.
Go for it.
Al