Sites for reservoirs and other hydraulic works necessary for the storage and utilization of water for irrigation and the prevention of floods and overflows, located or selected prior to August 30, 1890, shall remain segregated and reserved from entry, or settlement, until otherwise provided by law, and reservoir sites thereafter located or selected on public lands shall in like manner be reserved from the date of the location or selection thereof.
43 U.S. Code § 662 - Reservation of reservoir sites generally
Section is based on provisions contained in acts Oct. 2, 1888, and Aug. 30, 1890, affected by act Oct. 21, 1976.
1976—Pub. L. 94–579 struck out provision authorizing the President, in his discretion, to open by proclamation any portion or all of the lands reserved by this section to settlement under the homestead laws.