Water District 1 Weekly Water Reports

MID is sharing the weekly Water District 1 reports to help keep our water users informed throughout the irrigation season. These reports provide updates on snowpack conditions, river flows, reservoir storage, and projected water availability across the Upper Snake River Basin. Because this is expected to be a tight water year, we want our waterusers to have direct access to the same information we are using to monitor conditions and make operational decisions. We will continue posting these reports each week as new updates become available.

 

June 3, 2026

A combination of late-season snowmelt and weekend rainfall provided a welcome boost to river flows, allowing additional water to be stored and improving water right priorities across the system. The recent runoff helped fill the Jackson 1913 water right and provided small gains to several other reservoir storage rights. While these short-term improvements are encouraging, Water District 1 notes that water supply outlooks for the rest of the irrigation season remain challenging, with streamflow forecasts below average and warmer-than-normal temperatures expected this summer. As snowmelt comes to an end, water managers will be closely monitoring conditions and upcoming allocation estimates.

2026-06-03 WD1 Report.pdf

May 27, 2026

Warmer temperatures and recent snowmelt provided a brief boost to river flows, allowing some additional water to be stored and improving water right priorities for a few days. While some high-elevation snow remains, runoff has slowed from last week's peak, and water managers expect conditions to continue fluctuating as the remaining snow melts. Reservoir storage is now about 62% full, and the system has entered its seasonal drawdown period, with storage levels expected to decline throughout the summer. Overall, water supplies remain tight, and conditions will continue to be closely monitored as the irrigation season progresses.

2026-5-27 WD1 Report.pdf

May 20, 2026

Warmer weather over the past week has sped up snowmelt, helping boost river flows and improve water right priorities across the system. Even with those improvements, snowpack remains well below average in most areas, and reservoir storage has dropped to about 65% full, so water supply conditions are still uncertain. The report notes that while recent flows provided a short-term boost, what happens next will depend on temperatures and irrigation demand as the season continues.

2026-5-20 WD1 Report.pdf

May 13, 2026

A report was not published for this week. 

May 6, 2026

Warmer temperatures over the past week have helped increase snowmelt and impact river flows across parts of the system. Even with those improvements, snowpack in many areas remains well below average, so water supply conditions continue to be a concern heading into the summer irrigation season.The physical reservoir system is currently about 71% full, and water managers are working to balance irrigation demand while maintaining river flows throughout the basin. The report suggests that additional snowmelt in the coming weeks could provide some short-term improvement, but this is still expected to be a challenging water year overall.

WD1 Report 2026-5-6.pdf