In his first public speech, which had already been delivered, Lincoln had contended that the Sangamon river was navigable, and it now fell to his lot to assist in giving practical proof of his argument. A steamboat had arrived at New Salem from Cincinnati, and Lincoln was hired as an assistant in piloting the vessel through the uncertain channel of the Sangamon river to the Illinois river. The way was obstructed by a milldam. Lincoln insisted to the owners of the dam that under the Federal Constitution and laws no one had a right to dam up or obstruct a navigable stream and as he had already proved that the Sangamon was navigable a portion of the dam was torn away and the boat passed safely through.
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