In 1878 and again in 1889 it was wrecked by a freshet, and since then has been of little service.'
Every year there are, normally, two distinct periods of high water; one an early freshet due mainly to the heavy winter rainfall on the lower river, when the upper river is still frozen hard; the other in the late spring, due to the setting in of rains along the upper courses also, and to the melting of the snow in the mountains.
Whenever there is a freshet in Green River the streams in the cave are joined in a continuous body of water, the rise sometimes being 60 ft.
Here goes lumber from the Maine woods, which did not go out to sea in the last freshet, risen four dollars on the thousand because of what did go out or was split up; pine, spruce, cedar--first, second, third, and fourth qualities, so lately all of one quality, to wave over the bear, and moose, and caribou.
Wide, and in a freshet in 1870 the scour reached a depth of 51 ft.