Idaho Ex Rel. Evans v. Oregon

1983-06-23

Headline: Court dismisses Idaho’s bid to force a share of migrating salmon and steelhead, leaving Oregon and Washington’s fishing rules intact for now while Idaho may renew its claim.

Holding: The Court adopts the Special Master’s recommendation and dismisses Idaho’s original‑jurisdiction suit without prejudice because Idaho failed to show present clear and convincing injury and a workable apportionment is unwarranted.

Real World Impact:

Leaves Oregon and Washington’s fishing management in place for now.
Allows Idaho to sue again if it proves present deprivation.
Clarifies Court can fairly divide interstate migratory fish resources.

Topics: salmon and steelhead, interstate resource disputes, fishing limits, dams and fish migration, tribal fishing rights

Summary

Background

A dispute pits the State of Idaho against the States of Oregon and Washington over migrating chinook salmon and steelhead that travel the Columbia‑Snake River system. Idaho asked the Court to order a fair division of the fish that reach Idaho’s spawning grounds. The rivers are blocked by multiple dams that kill many smolts and adults, and fishing and treaty allocations with Indian Tribes further affect returns. The matter was tried before a Special Master, who filed a final report recommending dismissal.

Reasoning

The Court first held that equitable apportionment (a fair division the Court can order) applies to migratory fish as it does to interstate water. But the Court explained Idaho must prove by clear and convincing evidence that it now suffers real and substantial injury. The Special Master focused on conditions from 1975–1980, found Idaho had not carried that burden, and expressed concern about making a workable apportionment decree. Although the Court said a decree could be fashioned (noting Idaho’s jackfish‑based formula as one possible method), it agreed Idaho failed to prove present injury and therefore adopted the Master’s recommendation to dismiss the case without prejudice.

Real world impact

The decision leaves Oregon and Washington’s management of the lower Columbia in place for now and gives Idaho no immediate relief. Idaho may bring new proceedings if it later shows it is being deprived of its equitable share. The opinion also establishes that the Supreme Court can use equitable apportionment to resolve interstate disputes over migratory fish.

Dissents or concurrances

Justice O’Connor, joined by Justices Brennan and Stevens, dissented, arguing the Master wrongly excluded older and future evidence, failed to quantify Idaho’s fair share, and should have remanded for further proceedings.