Just saw someone's video post of them flying over a dam in Colorado and I just Wednesday had an issue while flying over a dam. Ok, I was shooting video and photos in a West Virginia state park (with permission). I then flew over and took shots of the dam.. I was about 200 feet above the dam. About 10 minutes later a guy pulls up with the Army Corps of engineers and tells me I can't fly here, take pictures out anything. He asked for my I'd, which I gave him and my 107. Something about article 36 and 327.4. The guy said it is federal property. He gives a warning but asks me to delete my shoot. Says that I can't post pictures or video of the dam but I can of the lake. I talk to the guy and he is cool but I don't think this is correct is it? I used b4ufly and airmap, the dji app and none gave me a warning. It isn't on the faa list of restricted areas on their list. Anyone familiar with this? Btw I didn't delete my footage lol.