From the above link;
........ACT -100 (hover barge) was loaded with 40 tons of cargo for another close-in test run. Once more, the helicopter showed it could move the barge despite the additional weight.
The final aspect of the test was to tow the hover barge over a 50-mile course to a drill site named Alaska Island where Sohio had just completed an oil well.
During the tow to the island, headwinds over 30 knots were encountered, and snow and ice buildup were also factors. Regardless, the Vertol was able to bring the empty barge to the island successfully. On the return trip to Prudhoe Bay, when this photo was taken, the barge carried 50 tons of cargo, bringing the total weight to 220 tons. As with the previous tests, this task was accomplished successfully.
This photograph is one of longtime Columbia Helicopters' photographer Ted Veal's most famous photographs. The use of a powerful telephoto lens makes it appear as though the helicopter is closer to the ice than is actually the case.
This was in 1982 with the smaller of the Vertol (Boeing) models. This model is now being phased out but it's big brother, the CH-47 Chinook, is at least 5 times as powerful as this old CH-46.