In this treaty fishing rights case, the Upper Skagit Indian Tribe (“the Upper Skagit”) filed a Request for Determination as to the geographic scope of the Suquamish Indian Tribe’s (“the Suquamish”) usual and accustomed fishing grounds and stations (“U&A”) as determined by Judge Boldt in 1975. Specifically, the Upper Skagit sought a determination that the Suquamish’s U&A determinations do not include Chuckanut Bay, Samish Bay, and a portion of Padilla Bay where the Upper Skagit has its own court-approved U&A determinations (“the Contested Waters”). On cross-motions for summary judgment, the district court concluded that Judge Boldt did not intend to include the Contested Waters in the Suquamish’s U&A determinations and, accordingly, granted summary judgment to the Upper Skagit. We have jurisdiction pursuant to 28 U.S.C. § 1291. Reviewing de novo, we affirm.