Idaho Code § 43-1707
The water rights to all lands acquired under the provisions of this chapter shall attach to and become appurtenant to the land as soon as title passes from the United States to the state.
[(43-1707) R.C., sec. 2386e, as added by 1911, ch. 71, sec. 2, p. 194, and 1911, ch. 154, sec. 6, p. 461; reen. C.L. 166:7; C.S., sec. 4460; I.C.A., sec. 42-1707.]