Cite as: 515 U. S. 1 (1995)
Opinion of the Court
braska is to have a fair opportunity to present its case for our doing so, we do not understand how we can preclude it from setting forth that evidence of environmental injury, or consign it to producing that evidence in some other forum, since this is the only Court in which Nebraska can challenge the Wyoming projects. And as for Wyoming's argument that any proof of environmental injury that Nebraska will present will be highly speculative, the point is urged prematurely. Purely speculative harms will not, of course, carry Nebraska's burden of showing substantial injury, but at this stage we certainly have no basis for judging Nebraska's proof, and no justification for denying Nebraska the chance to prove what it can.
C
Wyoming's third exception is to the Master's recommendation to allow Nebraska to proceed with its challenge to Wyoming's actions on Horse Creek, a tributary that flows into the North Platte below the Tri-State Dam. In Count I of its Amended Petition, Nebraska alleges that Wyoming is "presently violating and threatens to violate" Nebraska's equitable apportionment "by depleting the natural flows of the North Platte River by such projects as . . . reregulating reservoirs and canal linings in the . . . Horse Creek Conservancy District." App. to Third Interim Report D-5. Nebraska asks for an injunction against Wyoming's depletions of the creek.
Wyoming argues that the claim is simply not germane to this case, since Horse Creek feeds into the North Platte below the apportioned reach, the downstream boundary of which is the Tri-State Dam. It is clear, however, that the territorial scope of the case extends downstream of the pivotal reach. In the 1945 decision and decree, we held against apportioning that stretch of river between the Tri-State Dam and Bridgeport, Nebraska, not because it fell outside the geographic confines of the case, but because its needed water was "adequately supplied from return flows and other
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