State v. States Colorado
The Supreme Court resolved a dispute between Kansas and Nebraska over their shared Republican River water compact, ordering Nebraska to give up $1.8 million in gains for exceeding its water allotment but declining to issue an injunction against future violations.
The Court also sided with Nebraska on a separate technical dispute, ordering that an accounting formula be corrected so Nebraska is no longer wrongly charged for water imported from outside the river basin.
How it got here: Kansas sued Nebraska in the Supreme Court's original jurisdiction; the Court appointed a Special Master, who recommended partial disgorgement, no injunction, and a formula fix, and both states filed exceptions to his report.
The Case in Depth
What happened
Kansas, Nebraska, and Colorado share the Republican River under a 1943 interstate compact allocating the river's water. After earlier litigation over groundwater pumping, the states signed a 2002 settlement to improve compliance measurement. Kansas later found Nebraska had substantially exceeded its water allotment in 2005-2006, while Nebraska found the settlement's accounting formula wrongly counted water imported from the separate Platte River basin against its allotment.
The question before the Court
After Nebraska used more than its share of a shared river under an interstate water compact, could Kansas make Nebraska give up some of its extra profits, and could Nebraska get a flawed accounting formula fixed?
Why it matters
Farmers and water officials in Kansas and Nebraska will operate under corrected accounting rules going forward, and Nebraska must pay a financial penalty beyond actual damages for its past overuse. The ruling also signals to states sharing interstate compacts that reckless (not just deliberate) violations can trigger disgorgement of profits, shaping how future compact disputes are litigated and settled.
What changes now
The ruling is final: Nebraska must pay Kansas $3.7 million in damages plus $1.8 million in disgorged gains, without a court order requiring future compliance. The accounting formula used to measure each state's water use will be corrected going forward so imported water is properly excluded. The states will continue administering the compact under these clarified rules, with disgorgement now established as a potential future remedy if violations recur.
What this does not decide
The Court did not adopt a general rule that any breach of an interstate compact triggers disgorgement; it limited the remedy to situations where a state recklessly disregards another state's rights, and it declined to order an injunction because Nebraska's new compliance measures reduced the risk of repeat violations.
Concurrences and dissents
Dissent in part — Justice Roberts
Chief Justice Roberts agreed with the Court's finding that Nebraska knowingly breached the compact and with the decision not to issue an injunction, and he accepted disgorgement as an available remedy. But he disagreed that the Court's equitable power extends to rewriting the accounting formula the states had agreed to, joining that portion of Justice Thomas's opinion.
Dissent in part — Justice Scalia
Justice Scalia joined Justice Thomas's dissent in full and wrote separately to caution that modern Restatements of law, including the Restatement provision on disgorgement relied on by the majority, often reflect scholars' aspirations rather than an accurate description of existing law and should be treated skeptically.
Dissent in part — Justice Thomas
“Disgorgement is strong medicine, and as with other forms of equitable power, we should impose it against the States "only sparingly."”Thomas's objection that the majority too readily expanded an extraordinary remedy against a sovereign state.
Justice Thomas argued the Court should have applied ordinary contract-law principles rather than expansive equitable power to this dispute between sovereign states. He would have rejected disgorgement entirely because Nebraska's breach was not deliberate, and separately would have rejected reforming the settlement's accounting formula because the states made no mistake in writing the agreement, only in judging how well it would work.
How the Court got there
The legal reasoning, step by step
- The Court explained that its original jurisdiction over disputes between states carries broad equitable power, greater than in ordinary private lawsuits, because an interstate compact is both a contract between sovereigns and, once approved by Congress, a federal law that the Court must enforce.
- Applying that equitable authority, the Court asked whether Nebraska's overuse of water was merely negligent or was more culpable. It concluded Nebraska had 'knowingly' exposed Kansas to a substantial risk of shortfall by delaying and under-designing its compliance measures for years, even though it did not deliberately set out to breach the compact.
- The Court held that this knowing, reckless disregard of Kansas's rights was serious enough to justify disgorgement of profits — an equitable remedy beyond ordinary damages — reasoning that requiring only actual damages would let an upstream state profitably keep taking more than its share as long as it could afford to pay for the loss.
- In setting the amount, the Court found that a partial, rather than full, disgorgement award was appropriate because Nebraska had already reformed its water-management system since the breach, reducing the risk of repeat violations and making a smaller award sufficient to deter future misconduct.
- On Nebraska's request to fix the accounting formula, the Court reasoned that the compact only covers water originating within the Republican River Basin, so a formula that mistakenv counted imported Platte River water against Nebraska's allotment exceeded the compact's scope and effectively violated federal law, giving the Court authority to correct the technical formula to match the parties' original intent.
Doctrinal impact
Cases affected by this decision
Reaffirms Texas v. New Mexico (482 U.S. 124)
Relied on as authority that courts may craft fair equitable remedies, including damages, for compact violations.
Reaffirms Kansas v. Colorado (543 U.S. 86)
Cited as precedent for modifying a technical measurement agreement to accurately implement a compact.
Reaffirms Porter v. Warner Holding Co. (328 U.S. 395)
Used to support broader equitable remedial power when public law and federal statutes are at stake.