Idaho Constitution Art. I, § 14. Right of eminent domain

The necessary use of lands for the construction of reservoirs or storage basins, for the purpose of irrigation, or for rights of way for the construction of canals, ditches, flumes or pipes, to convey water to the place of use for any useful, beneficial or necessary purpose, or for drainage; or for the drainage of mines, or the working thereof, by means of roads, railroads, tramways, cuts, tunnels, shafts, hoisting works, dumps, or other necessary means to their complete development, or any other use necessary to the complete development of the material resources of the state, or the preservation of the health of its inhabitants, is hereby declared to be a public use, and subject to the regulation and control of the state.

Private property may be taken for public use, but not until a just compensation, to be ascertained in the manner prescribed by law, shall be paid therefor.