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Captain Sanders, in the forties, had estimated that it cost about fifteen dollars to remove each ordinary snag from the Ohio. In the Mississippi the roots of snags could be thrown into the deep pools where they would soon become buried in mud; but on the Ohio such pools were not frequent and it was usually necessary to carry the roots ashore and destroy them with gunpowder. Sanders reported that up to September 1837 there had been three thousand three hundred and three obstructions removed from the Ohio. In 1839 there had been about ten thousand removed; at which time the work ceased. Some of the snags were six feet in diameter at the butt and over one hundred feet in length. In a report in 1835, on Mississippi improvement, Lieutenant Bowman stated: "It is a well-established fact that snags do not move far from where they first fall in, the weight of the earth attached to their roots serving as an anchor. It is also well established that trees which once float seldom form snags. Admitting this, it is sufficiently evident that if the banks are once cleared, there can be no subsequent formation of snags."