Said board shall have the right of eminent domain for the acquisition of lands necessary to the construction or widening of the proposed waterway, and may cause all necessary lands to be condemned and appropriated or damaged for the use of said waterway, and make just compensation therefor. The private property of the state, the county, and other public or quasi-public corporations (except incorporated cities and towns), and of private corporations, shall be subject to the same rights of eminent domain at the suit of said board as the property of private individuals.