Rock River, Ill. and Wis. Reports on preliminary examination and survey of Rock River, with view to securing channel 7 feet deep from dam at head of feeder of Illinois and Mississippi Canal, at or near Sterling, Ill., to Janesville, Wis.; also with view to ascertaining whether, for maintenance of navigation, storage reservoirs are necessary at or near headwaters of said river, and to determine what portion of cost of said improvement should be borne by owners of water power and others.

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