Minidoka County Water Intelligence Brief

October 5, 2026 | Free-Tier Edition

Situation Summary

Snake River flows at Howells Ferry are registering 3,570 cfs and falling, reflecting typical late-season recession as irrigation demand winds down and upstream snowmelt contributions remain absent. For Minidoka County irrigators, this falling trajectory means the pre-Milner supply signal is tightening heading into the final stretch of the 2026 season — a condition relevant to both active potato harvest operations and ongoing dairy water needs. Reservoir storage data for Lake Walcott and upstream facilities, along with 7-day forecast details, are available in the full brief.

Snowpack Conditions

The Lewis Lake Divide SNOTEL station is reporting 0.0 inches of snow water equivalent (SWE) and 0.0 inches of snow depth as of October 4 — consistent with normal seasonal conditions for this point in the calendar, when the median SWE for this date is also effectively zero. No below-normal language applies here. The relevant 2026 snowpack story is one of timing: this station melted out 4–6 weeks ahead of the historical median meltout date, driven by an anomalous March heat wave. That early meltout is now historical background, not an active operational variable. No new snowpack accumulation is contributing to Snake River flows at this time.

Streamflow Conditions

The Snake River near Minidoka at Howells Ferry (USGS 13081500) recorded 3,570 cfs on October 4, with flow on a falling trend. This gauge — draining approximately 15,700 square miles of upper Snake River basin — functions as the upstream supply signal for the entire Magic Valley corridor, reflecting what the Snake River is delivering before Milner Dam and the downstream diversion network. At 3,570 cfs and falling, late-season flows are contracting in line with post-peak-season recession. Minidoka County users, positioned upstream of Milner, are seeing these supply conditions earlier in the delivery chain than Twin Falls, Jerome, or Cassia county irrigators. The falling trajectory warrants close monitoring as potato harvest operations continue through October.

Seasonal Guidance

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Data Sources: SNOTEL data through October 4, 2026; USGS streamflow data through October 4, 2026

Data Current As Of: Data reflects conditions reported through October 4–5, 2026. Contact Idaho Department of Water Resources (Eastern Regional Office, Pocatello, (208) 525-7161) for current administrative and monitoring information.

Important Disclaimers: This brief provides automated analysis for informational purposes only. Specific numerical claims have not been independently verified. Consult official sources including your local water district, U.S. Bureau of Reclamation Pacific Northwest Region (Boise office — operates Minidoka Dam and the Minidoka Project, including Lake Walcott), Minidoka Irrigation District (primary delivery entity receiving water from Minidoka Dam diversions), Idaho Department of Water Resources (IDWR — administers Water District 36, middle Snake River), and U.S. Bureau of Reclamation for American Falls Reservoir and Palisades Reservoir upstream context, for all regulatory decisions and water rights administration.