; (B) any activity relating to scheduled or unscheduled maintenance of a project; and (C) any activity relating to repairing, replacing, or rehabilitating a feature of a project. (19) Pick-sloan missouri river basin program The term Pick-Sloan Missouri River Basin Program means the Pick-Sloan Missouri River Basin Program (authorized by section 9 of the Act of December 22, 1944 (commonly known as the Flood Control Act of 1944 ) (58 Stat. 891, chapter 665)). (20) PMM The term PMM means the Principal Meridian, Montana. (21) Reservation (A) In general The term Reservation means the area of the Fort Belknap Reservation in the State, as modified by this Act. (B) Inclusions The term Reservation includes— (i) all land and interests in land established by— (I) the Agreement with the Gros Ventre and Assiniboine Tribes of the Fort Belknap Reservation, ratified by the Act of May 1, 1888 (25 Stat. 113, chapter 212), as modified by the Agreement with the Indians of the Fort Belknap Reservation of October 9, 1895 (ratified by the Act of June 10, 1896) (29 Stat. 350, chapter 398); (II) the Act of March 3, 1921 (41 Stat. 1355, chapter 135); and (III) Public Law 94–114 ( 25 U.S.C. 5501 et seq. ); (ii) the land known as the Hancock lands purchased by the Fort Belknap Indian Community pursuant to the Fort Belknap Indian Community Council Resolution No. 234–89 (October 2, 1989); and (iii) all land transferred to the United States to be held in trust for the benefit of the Fort Belknap Indian Community under section 6. (22) Secretary The term Secretary means the Secretary of the Interior. (23) St. mary unit (A) In general The term St. Mary Unit means the St. Mary Storage Unit of the Milk River Project authorized by Congress on March 25, 1905. (B) Inclusions The term St. Mary Unit includes— (i) Sherburne Dam and Reservoir; (ii) Swift Current Creek Dike; (iii) Lower St. Mary Lake; (iv) St. Mary Canal Diversion Dam