Maybe someone here can offer advice. (this is in the Atlanta area)

My wife and I have 7 acres and are putting in a driveway looking to be about
1000 feet or more long. The lot itself is pie shaped and 1257 feet deep. We
have had the trees cleared from the driveway area and now need to bed the
road. We have to cross a large low area at the front of the property and two
creeks after that. We have the culvets for the creeks already and that part
seems easy compared to crossing the first part of the lot. This low area I
know needs drainage but my question is more about the driveway part.

Using riprap, how deep should we bed? Approximately how much square footage
will you get from a ton of riprap? Will gravel suppliers work with you on
the price if you are buying more than just a couple of loads?

Thanks in advance.