; and (B) the portion of the Milk River and each tributary of the Milk River that flows through the Canadian Provinces of Alberta and Saskatchewan. (15) Milk river project (A) In general The term Milk River Project means the Bureau of Reclamation project conditionally approved by the Secretary on March 14, 1903, pursuant to the Act of June 17, 1902 (32 Stat. 388, chapter 1093), commencing at Lake Sherburne Reservoir and providing water to a point approximately 6 miles east of Nashua, Montana. (B) Inclusions The term Milk River Project includes— (i) the St. Mary Unit; (ii) the Fresno Dam and Reservoir; and (iii) the Dodson pumping unit. (16) Missouri river basin The term Missouri River Basin means the hydrologic basin of the Missouri River, including tributaries. (17) Operations and maintenance The term operations and maintenance means the Bureau of Indian Affairs operations and maintenance activities related to costs described in section 171.500 of title 25, Code of Federal Regulations (or a successor regulation). (18) Operations, maintenance, and replacement The term operations, maintenance, and replacement means— (A) any recurring or ongoing activity associated with the day-to-day operation of a project; (B) any activity relating to scheduled or unscheduled maintenance of a project