Jerome County, ID — Agricultural Water Intelligence Brief

September 14, 2026 | Free-Tier Edition

Situation Summary

North Side Canal Company deliveries are in the final weeks of the 2026 irrigation season, with late-season alfalfa cutting schedules and dairy operation water needs driving current demand. Upstream reservoir storage at American Falls and Palisades — the source of 80% of Jerome County's irrigation water — remains the critical variable that canal operators and dairy managers should be actively monitoring through IDWR and USBR direct channels. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

Lewis Lake Divide (Teton County, WY | Elev. 7,880 ft | 09/13/2026): SWE 0.0", snow depth 0.0"

September snowpack readings of zero are entirely normal for this station at this point in the calendar year — the historical median SWE for mid-September is also 0.0", so this reading does not indicate a below-normal condition today. The relevant snowpack story for Jerome County in 2026 is timing: Lewis Lake Divide melted out approximately 4–6 weeks ahead of its historical median meltout date, driven by an anomalous March heat wave. That early meltout accelerated spring runoff into the upper Snake River system — Jackson Lake, Palisades, and American Falls — weeks earlier than normal, compressing the storage capture window that Jerome County depends on. The snowpack signal now belongs to history; current supply is a function of what reservoirs retained from that early runoff pulse.

Streamflow Conditions

No active USGS streamflow gauges within Jerome County boundaries provide agricultural supply data. Jerome County's relevant streamflow references are the Snake River at Milner Dam (USGS 13087995, pre-diversion) and the Snake River near Twin Falls (USGS 13090500), both physically located outside Jerome County but serving as the definitive upstream supply indicators for North Side Canal deliveries. During peak irrigation season, near-zero flow below Milner Dam is normal operational behavior — the canal system is capturing essentially the full Snake River flow as designed. No gauge data was available for inclusion in this edition. Contact North Side Canal Company or IDWR Water District 36 directly for current diversion and delivery status.

Seasonal Guidance

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

Data Sources: SNOTEL data through September 13, 2026; USGS streamflow data through September 14, 2026

Data Current As Of: September 14, 2026

Important Disclaimers: This brief provides automated analysis for informational purposes only. Specific numerical claims have not been independently verified. Consult official sources including IDWR (administers Water District 36, middle Snake River priority system), North Side Canal Company (primary north-bank diverter at Milner Dam, ~85,000 acres across Jerome, Lincoln, and adjacent counties), A&B Irrigation District (USBR project serving northern Magic Valley), and USBR Pacific Northwest Region (Boise office) for American Falls and Palisades upstream storage context before making irrigation or operational decisions.