Sediment samples indicate that the Maquoketa River has been, in the past, an important factor in the deposition that has taken place in the Mississippi River in a reach extending at least 41/2 miles below the junction of these streams. It is believed that the straightening of the tributary stream was an important factor in the increased deposition between 1930 and 1937 Computations show that in the reach of river studied approximately 30 per cent of the sediment was derived from the Maquoketa River.

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