To authorize certain elements of the Yakima River Basin Water Enhancement Project, and for other purposes.

[AI summary unavailable — showing source text] Directs the Secretary of the Interior to establish and administer a Yakima River Basin Water Conservation Program. Authorizes the Secretary to make grants to eligible entities to carry out this Act. Prohibits conserved water resulting from the expenditure of Federal funds from being used to expand irrigation in the basin, except on the Yakama Indian Reservation. Directs the Secretary to establish the Yakima River Basin Conservation Advisory Group. Requires entities to submit water conservation plans to the Secretary for approval in order to participate in the conservation program. Authorizes appropriations. Provides for the implementation by the Yakama Indian Nation of: (1) an irrigation demonstration project on the Yakama Indian Reservation that shall provide for the construction of distribution and on-farm irrigation facilities to use water savings resulting from system improvements to the Wapato Irrigation Project; and (2) a Toppenish Creek corridor enhancement project to demonstrate integration of management of agricultural, fish, wildlife, and cultural resources to meet tribal objectives. Authorizes appropriations. Details the instream flows the Secretary is required to provid…