Nebraska v. Wyoming
The Supreme Court approved a settlement among Nebraska, Wyoming, and Colorado over how to share the North Platte River's water, replacing the Court's original 1945 decree (as amended in 1953) with a detailed Modified Decree.
The new decree sets specific limits on irrigation acreage, water storage, and diversions for each state, creates a joint committee to monitor compliance, and dismisses all outstanding claims between the states with prejudice, closing out litigation that had restarted in 1986.
How it got here: Nebraska sued Wyoming in 1986; after years of litigation and a Special Master's involvement, the parties reached a settlement that the Special Master recommended the Court approve.
The Case in Depth
What happened
In 1945 the Supreme Court divided the North Platte River's water among Colorado, Wyoming, and Nebraska, later amending that decree in 1953. Decades later, in 1986, Nebraska sued Wyoming again over water use, and Wyoming counterclaimed and brought in the United States. After years of litigation, all the parties negotiated a comprehensive settlement covering irrigation limits, reservoir storage, and record-keeping along the river.
The question before the Court
Could Nebraska, Wyoming, and Colorado settle their decades-old dispute over sharing the North Platte River by asking the Court to approve a new, updated water-sharing decree?
Why it matters
Farmers, irrigation districts, and water managers across three states now operate under clear, updated rules for how much river water each state can use, store, or export. The new North Platte Decree Committee gives the states and the federal government an ongoing forum to resolve disputes without returning to the Supreme Court every time.
What changes now
The Modified Decree is now the governing law for how Colorado, Wyoming, and Nebraska share the North Platte River. The newly created North Platte Decree Committee will monitor compliance, administer the accounting methodologies, and resolve day-to-day disputes, with any unresolved disagreements able to come back before the Court under the Court's retained jurisdiction. Costs of the litigation will be allocated in a later order.
What this does not decide
The Modified Decree does not affect water rights among users within a single state, storage water owned under existing contracts, water imported from other river basins, the Nebraska-Colorado South Platte compact, or small "de minimis" water uses, all of which remain governed by other law.
How the Court got there
The legal reasoning, step by step
- The Court reviewed the Special Master's Final Report recommending approval of a settlement that all the states and the United States had negotiated to resolve the long-running water dispute.
- Because the parties had voluntarily agreed on detailed terms for dividing irrigation acreage, storage limits, and diversion rights along the North Platte River and its tributaries, the Court treated the settlement as an appropriate basis for a consent decree rather than continued litigation.
- The Court approved the Final Settlement Stipulation as fair and adequate, finding no reason to disturb the parties' negotiated resolution of their competing water claims.
- The Court then replaced the original 1945 decree, as amended in 1953, with a new Modified Decree incorporating the settlement's specific injunctions on each state's water use.
- Having adopted the settlement's terms as the operative decree, the Court dismissed with prejudice all claims, counterclaims, and cross-claims the parties had raised or could have raised in the case.
Doctrinal impact
Cases affected by this decision
Limits Nebraska v. Wyoming (325 U. S. 589)
The 1945 decree apportioning the North Platte River is replaced by this new Modified Decree.
Limits Nebraska v. Wyoming (345 U. S. 981)
The 1953 amendment to the original decree is superseded by the new Modified Decree's terms.