Not recommending it. However, I’m a professional pilot and the rules are:
- can’t fly an aircraft lower than an altitude at which you can lose an engine and make an emergency landing without “undue hazard to persons or property”. With a bush plane over the prairie, this is pretty much any altitude.
- over uncongested areas, no lower than 500 above the surface EXCEPT over sparsely populated areas (aka - Wyoming). In that case, no closer than 500 feet from persons or structures. For the record, 500 feet is really close, and is a direct line and not an overflight. So I can fly 50 feet above the ground, 500 lateral feet away from you, and be legal.