1831, in company with others, I commenced the building of a flatboat on the Sangamon, and finished and took her out in the course of the spring. Since that time I have been concerned in the mill at New Salem. These circumstances are sufficient evidence that I have not been very inattentive to the stages of the water. The time at which we crossed the mill-dam being in the last days of April, the water was lower than it had been since the breaking of winter in February, or than it was for several weeks after. The principal difficulties we encountered in descending the river were from the drifted timber, which obstructions all know are not difficult to be removed. Knowing almost precisely the height of water at that time, I believe I am safe in saying that it has as often been higher as lower since.
From this view of the subject it appears that my calculations with regard to the navigation of the Sangamon cannot but be founded in reason; but, whatever may be its natural advantages, certain it is that it never can be practically useful to any great extent without being greatly improved by art. The drifted timber, as I have before mentioned, is the most formidable barrier to this object. Of all parts of this river, none will require so much labor in proportion to make it navigable as the last thirty or thirty-five miles; and going with the meanderings of the channel, when we are this distance above its mouth we are only between twelve and eighteen miles above Beardstown in something near a straight direction; and this route is upon such low ground as to retain water in many places during the season, and in all parts such as to draw two thirds or three fourths of the river water at all high stages.
