Firefighting, Fishin--you name it, its beeing done:
This one is able to lift 3744 lbs, (450 gallons), of water at 8,000 ft, 20 deg C, with 255 gallons of Jet A. Obviously as the fuel burns it can lift more water. This dip site is actually 8,600 ft, just inside Montana on the continental divide--the Willow Fire.