43 U.S.C. § 386
Application of excess-land provisions of reclamation laws to certain lands
The excess-land provisions of the Federal reclamation laws shall not be applicable to lands which on June 16, 1938 , had an irrigation water supply from sources other than a Federal reclamation project and which will receive a supplemental supply from the Colorado-Big Thompson project.
( June 16, 1938, ch. 485 , 52 Stat. 764 .)