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Northern Arapaho Tribe argues Wyoming already lost reservation boundary argument


CHEYENNE, Wyoming — The Northern Arapaho Tribe says the state of Wyoming can't argue against a federal agency's recent conclusion that Riverton and surrounding lands remain legally part of the Wind River Indian Reservation.

The tribe filed a brief in a federal appeals court this week arguing that Wyoming already lost its claim that Riverton's status as "Indian Country" was extinguished when Congress threw the area open to settlement by non-Indians 100 years ago. The tribe says the state first raised and lost the claim in the 1980s in a lawsuit over Bighorn River water rights and can't raise it again.

Wyoming now is appealing a recent decision by the U.S. Environmental Protection Agency that Riverton and surrounding lands remain legally Indian country for purposes of administering the federal Clean Air Act.

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