Minidoka County Agricultural Water Intelligence Brief

October 12, 2026 | Free-Tier Edition

Situation Summary

Snake River flows at Howells Ferry are running at 1,600 cfs and falling — a late-season condition that signals the tail end of the irrigation season for Minidoka Irrigation District deliveries from Lake Walcott. With flows on a declining trajectory, irrigators managing final potato and sugar beet harvest irrigation should be coordinating directly with Minidoka Irrigation District on delivery scheduling and any anticipated end-of-season cutoff timing. Reservoir storage data for Lake Walcott and 7-day forecast details are available in the full brief.

Snowpack Conditions

Lewis Lake Divide (10/11): SWE 0.1", snow depth 0.0"

Lewis Lake Divide is reporting trace SWE with no measurable snow depth — a fully normal condition for this station at this point in the calendar. The median SWE for mid-October at this elevation is also 0.0", so no below-normal signal is present in today's reading. The operative snowpack story for 2026 is timing: this station melted out approximately 4–6 weeks ahead of the historical median meltout date due to the anomalous March heat wave, compressing the spring runoff pulse and accelerating the transition to baseflow conditions earlier in the season. New seasonal snowpack accumulation at this station typically begins in November — current readings reflect the normal late-October shoulder period between meltout and first accumulation.

Streamflow Conditions

Snake River near Minidoka at Howells Ferry (USGS 13081500): 1,600 cfs, falling (10/12)

The Howells Ferry gauge is the upstream supply signal for the entire Magic Valley corridor, capturing Snake River conditions across a 15,700-square-mile drainage before flows reach Milner Dam and the downstream diversion systems in Twin Falls, Jerome, and Cassia counties. At 1,600 cfs and on a falling trend, the river is in a characteristic late-season declining pattern consistent with the end of the irrigation season. Minidoka County irrigators are upstream of Milner — what Howells Ferry shows today is a leading indicator of what the downstream corridor will see in the weeks ahead. Declining flows at this gauge reflect reduced upstream contributions as irrigation demand winds down and mountain snowmelt is fully exhausted for the season.

Seasonal Guidance

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Data Sources: SNOTEL data through October 11, 2026; USGS streamflow data through October 12, 2026

Data Current As Of: USGS National Water Information System and NRCS SNOTEL network, as of dates noted above. 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 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.