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.

 

July 15, 2026

Natural river flows continue to decline as the irrigation season progresses, causing water right priorities above Blackfoot to move to increasingly senior dates. Water District 1 reports that water supplies remain well below normal, with natural flows near the lowest levels seen over the past 30 years and drought conditions now affecting all of eastern Idaho. While water right priorities below Blackfoot have remained stable, meaningful improvements will likely require widespread, significant rainfall across the watershed. Until then, water managers expect conditions to remain tight as the season continues.

2026-7-15 WD1 Report.pdf

 

July 8, 2026

River flows continue to decline as the effects of spring snowmelt fade, causing water right priorities to move to increasingly senior dates across much of the basin. Water District 1 reports that the Teton River has now joined the Snake River above Blackfoot in delivering more senior water rights, reflecting the ongoing reduction in available natural flow. While conditions below Blackfoot have remained more stable, overall water supplies remain tight and are tracking similarly to last year's dry conditions. Updated storage allocation information is now available to help water users monitor the remaining water supplies for the rest of the irrigation season.

2026-07-08 Water Report.pdf

 June 30, 2026

Water supplies continue to tighten as river flows decline and water right priorities have now officially split at Blackfoot, a change that Water District 1 expects to remain in place for the rest of the irrigation season. While weekend rainfall provided a small boost to some streams, it wasn't enough to significantly improve overall conditions. Irrigation demand has continued to increase, and water users should expect priorities above Blackfoot to become more senior in the coming weeks. Preliminary storage allocations, along with current rentals and leases, remain available to help water users track the supplies available for the rest of the season.

2026-6-30 Water Report.pdf

June 24, 2026

Water supplies remain tight as river flows continue to gradually decline, although water right priorities have held steadier than expected over the past week. Water District 1 notes that cooler, wetter weather may provide some short-term relief, but conditions are still being closely monitored as irrigation demand continues to increase. Preliminary storage allocations, approved rentals, and remaining storage balances are now available, giving water users a clearer picture of the water available for the rest of the season.

2026-06-24 Water Report.pdf

June 18, 2026

 Water right priorities have remained slightly stronger than expected over the past week, but Water District 1 cautions that conditions could change quickly as irrigation demand continues to increase. Preliminary storage allocations have now been released, giving water users a clearer picture of the supplies available for the remainder of the season. While recent river flows have helped maintain conditions near the 1900 priority level, reservoir storage continues to decline and water managers expect supplies to remain tight throughout the summer. The report also notes that a 25,000 acre-foot water exchange from the Payette Basin has been approved to help support water availability in the Upper Snake River Basin.

2026-06-18 Water Report.pdf

June 10, 2026

Recent snowmelt and rainfall have helped keep river flows higher than expected, which has temporarily improved water right priorities and delayed some of the impacts typically seen this time of year. However, Water District 1 notes that water supplies remain extremely tight, with drought conditions, very low soil moisture, and below-average streamflow forecasts continuing across the basin. As irrigation demand increases through the summer, curtailments are expected to begin soon, and reservoir storage levels are projected to decline significantly by the end of the season. Storage allocation information is expected to be released in the coming weeks and will provide a clearer picture of available supplies moving forward.

2026-06-10 Water Report.pdf

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