Jerome County, ID — Water Intelligence Brief

June 29, 2026 | Free Tier

Situation Summary

The 2026 irrigation season opened under an early-melt signal across the Magic Valley watershed, with high-elevation snowpack melting out 4–6 weeks ahead of the historical median meltout date following an anomalous March heat event. For Jerome County's dairy operations and Northside Canal Company deliveries, the practical question is not snowpack remaining — there is none — but rather what upstream Snake River storage and current flows mean for the balance of the irrigation season and year-round dairy water demand. Reservoir storage data, 7-day forecast details, and late-season delivery reliability analysis are available in the full brief.

Snowpack Conditions

Galena Summit SNOTEL (06/28/2026): Snow Water Equivalent 0.0", Snow Depth 0.0"

Galena Summit has fully melted out, which is the expected condition for this station at this point in late June — the median SWE for this date is also 0.0", so this reading does not indicate a below-normal snowpack today. The meaningful signal for 2026 is timing: Galena Summit melted out approximately 4–6 weeks ahead of its historical median meltout date, driven by the March heat event. That early meltout means the natural snowmelt pulse that typically sustains Snake River flows into July arrived and passed well ahead of schedule. For Northside Canal operations, this translates to a shorter window of abundant snowmelt-driven supply and an earlier reliance on upstream reservoir releases to maintain diversion volumes at Milner Dam.

Streamflow Conditions

No active USGS streamflow gauges within Jerome County boundaries provide agricultural supply data — the only in-county USGS measurement point is Devils Washbowl Spring, a spring vent with a 0.22 square mile drainage area that is not a supply indicator for irrigation or dairy operations. Jerome County's water supply picture is read entirely through two Snake River gauges located outside county boundaries: Snake River at Milner (13087995), the pre-diversion indicator governing what is available for Northside Canal Company to divert from the north bank, and Snake River near Twin Falls (13090500), the post-diversion basin integrator. No current gauge readings were provided in this brief's data window. Users should check USGS WaterWatch directly for current readings at both stations. Near-zero flow below Milner Dam during active irrigation season is normal — it reflects full diversion operations by both Northside Canal Company and Twin Falls Canal Company, not a supply failure. The supply signal that matters is above-Milner flow volume and upstream storage releases.

Seasonal Guidance

Subscribe for the full brief including reservoir storage, weather forecasts, depletion analysis, and detailed operational recommendations.

Data Sources: SNOTEL data through June 28, 2026; USGS streamflow data through June 29, 2026. NRCS SNOTEL network (1 station); USGS National Water Information System (0 active in-county gauges).

Data Current As Of: June 29, 2026. IDWR Eastern Regional Office, Pocatello: (208) 525-7161.

Important Disclaimers: This brief provides automated analysis for informational purposes only. Specific numerical claims have not been independently verified. Consult official sources including Northside Canal Company (primary north-bank Milner Dam diverter, ~85,000 acres across Jerome, Lincoln, and adjacent counties), A&B Irrigation District (USBR project serving portions of northern Magic Valley including Jerome and Lincoln counties), Idaho Department of Water Resources — Water District 36 (middle Snake River priority administration), and U.S. Bureau of Reclamation Pacific Northwest Region (Boise office) for American Falls and Palisades upstream storage context. This brief does not constitute water rights, legal, or engineering advice.