BOISE — The Idaho Department of Water Resources announced Thursday that holders of Snake River water trust rights will not face curtailment during the 2026 irrigation season, a decision officials say tries to avert additional strain on farmers already hit by one of the basin’s most severe droughts in years.
“Given the intensity of the 2026 drought in the Snake River Basin and the hardships faced by Idaho farmers this year … Gov. (Brad) Little and Idaho Power officials agreed that further hardship with the potential curtailment of trust water rights due to reduced flows at Swan Falls Dam and the Murphy Gage should be avoided,” the Idaho Department of Water Resources said in a news release.
The move stems from provisions of the 1984 Swan Falls Settlement Agreement, which set minimum stream flows at the Murphy Gage near Swan Falls Dam and created the trust water rights framework when the state and Idaho Power resolved disputes over balancing irrigation and hydropower needs. This year, flows threatened to drop below that minimum for the first time since the settlement.
Why curtailment matters
Under the settlement, the department would be required to curtail trust water users if flows slipped below the established threshold of 3,900 cubic feet per second near Swan Falls. In June, the department warned more than 4,000 trust water users that curtailment was a possibility if streamflow declined past that point.
Idaho Power notified the governor it would not press for curtailment this year, and Little asked the water department to secure stored water to offset lower river flows, the department said. Officials emphasized the decision does not permanently fix the basin’s drought problems.
Local context and implications
Swan Falls Dam, located roughly 20 miles south of Kuna, is a key control point for flows on the lower Snake River. When flows approach the settlement minimum, administrators must weigh crop and pasture needs against hydroelectric generation and downstream obligations.
- Minimum flow standard: 3,900 cfs at Murphy Gage
- Trust users notified earlier: More than 4,000 could have been curtailed
- Short-term fix: Idaho Power agreed not to seek curtailment; governor asked for storage water to offset depleted flows
The department’s announcement attempts to limit immediate pain for irrigators who are already coping with reduced water supplies and increased costs. But it leaves open broader questions about how the state will manage recurring low-flow years as climate trends and water demand patterns change.
| Item | Detail |
|---|---|
| Flow threshold at Murphy Gage | 3,900 cfs |
| Users warned of possible curtailment | More than 4,000 |
| Relevant agreement | 1984 Swan Falls Settlement Agreement |
For farmers who rely on trust water, the announcement brings short-term relief but not certainty. Officials did not say how much stored water will be secured or how long those measures will be sustainable if extremely low flows continue. The department’s language also made clear that while curtailment is being avoided this season, the underlying vulnerability of the river system remains.
As Idaho moves through this drought year, the decision highlights an ongoing challenge: balancing competing uses for limited water resources while trying to shield agricultural communities from sudden losses of supply. How state leaders, irrigators and power operators respond in coming months will shape whether this pause becomes a bridge to a more resilient strategy or simply a temporary reprieve.
— Wyatt Larsen, Idaho correspondent
