Minidoka County Water Intelligence Brief

August 3, 2026 | Free Tier

Situation Summary

The 2026 irrigation season opened under an early-melt signature — snowpack stations in the upper Snake River basin melted out 4–6 weeks ahead of the historical median meltout date following an anomalous March heat wave, shifting the season's supply curve earlier than normal. Snake River flows at Howells Ferry are currently in the mid-season range, and Lake Walcott storage status — the county's defining supply variable — should be confirmed directly with USBR Pacific Northwest Region or Minidoka Irrigation District. Reservoir storage data, 7-day forecast details, and depletion analysis are available in the full brief.

Snowpack Conditions

Lewis Lake Divide (SNOTEL): As of August 2, 0.0" snow water equivalent, 0.0" snow depth.

No snowpack remains at the Lewis Lake Divide station, which is the standard seasonal condition for this station at this point in the calendar — the median SWE for early August is also 0.0". This reading does not indicate a below-normal condition for today's date. The meaningful 2026 signal is timing: this station melted out 4–6 weeks ahead of its historical median meltout date, meaning the spring pulse that recharges Snake River flows and contributes to Lake Walcott storage arrived and passed significantly earlier in the season than usual. No additional snowmelt-driven inflow should be anticipated for the remainder of the irrigation season.

Streamflow Conditions

Snake River near Minidoka at Howells Ferry (USGS 13081500): 8,960 cfs, stable, as of August 3.

The Howells Ferry gauge is the upstream supply signal for Minidoka County and the broader Magic Valley corridor — it reflects what the Snake River is delivering to Minidoka Dam before any downstream diversions at Milner. At 8,960 cfs with a stable trend, flows are within a functional mid-to-late-season range. Because the 2026 snowmelt pulse arrived 4–6 weeks early, flows at this gauge are now sustained primarily by reservoir releases and baseflow contributions rather than active snowmelt. Minidoka County irrigators should note that stable does not mean secure for the remainder of the season — late-season flow trajectories depend heavily on upstream storage operations at American Falls and Palisades reservoirs, neither of which is available through the USBR RISE API. Contact USBR Pacific Northwest Region (Boise office) for current upstream storage data.

Seasonal Guidance

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

Data Sources: SNOTEL data through August 2, 2026; USGS streamflow data through August 3, 2026

Data Current As Of: NRCS SNOTEL network and USGS National Water Information System, as noted above. For Idaho water administration: Idaho Department of Water Resources, 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 for regulatory decisions and water rights administration, including: Minidoka Irrigation District (primary delivery entity receiving water from Minidoka Dam diversions); U.S. Bureau of Reclamation, Pacific Northwest Region, Boise office (operates Minidoka Dam and Lake Walcott as part of the Minidoka Project; also the contact point for American Falls Reservoir and Palisades Reservoir upstream context); Idaho Department of Water Resources (administers Water District 36, middle Snake River); and your local water district for delivery scheduling and water rights status.