commercial low-flight safety

Denny wrote:
If it is a federal/state flyway or hunting area then it is protected
against low flights... Better check with the DNR before going low...
Usually 1500 feet or more AGL is required...

I thought that the only agency that congress delegated regulation of the
U.S. national airspace was the FAA. That is, if there is a specific
prohibition of the nature you state, it will be in an FAA NOTAM or
otherwise noted on FAA official charts or in regulations. I don't recall
anywhere in any of the training material that I have that a pilot is
expected to check for NOTAMs from the DNR, or NOTAMs for the IRS, or ...
well, you get the idea I hope.

I may indeed be wrong, but if so I'd appreciate some cites.