Here is the opinion in … oh, we’ll call it Johns v. United States.

An excerpt:

Under the particular and complicated facts of this case, there is no practical benefit to placing issue remarks on Claimants’  water rights stating that lands within their place of use were once  within  a former  Indian  reservation.  Although  the remark  is historically accurate, it serves no useful purpose.   Waters in Basin 41QJ are not physically available for diversion  or use  by the Blackfeet  Nation,  and  any  aboriginal  water  rights once  in existence  there  have been  terminated.        The   Blackfeet  Tribe  sued  and  recovered compensation  for this termination.   The Blackfeet  have not made a claim to water from Basin 41QJ in their Compact with the State of Montana and the United States.  The Tribe has not objected to the water rights in this case.  No injury has been demonstrated  to the Tribe or its members  if these or any water rights  in Basin 41QJ  are diverted  in accord with  their  actual  priority  dates.    The  United  States concedes  the  priority  dates  of Claimants’  water rights are valid and enforceable  against other non-Indian  water rights.