Minidoka County Water Intelligence Brief

August 24, 2026 | Free Tier

Situation Summary

The 2026 irrigation season entered its late-season phase following an anomalous early meltout, with high-elevation snowpack stations across the Magic Valley watershed melting out 4–6 weeks ahead of the historical median meltout date. The Snake River at Howells Ferry is currently delivering 7,580 cfs to the Minidoka Dam pool, providing the upstream supply signal for county irrigators and the broader Magic Valley corridor ahead of the critical potato and sugar beet harvest window. Reservoir storage data for Lake Walcott and upstream facilities, along with 7-day forecast details and depletion trend analysis, are available in the full brief.

Snowpack Conditions

Lewis Lake Divide SNOTEL (Station — August 23, 2026):

Snow Water Equivalent: 0.0" | Snow Depth: 0.0"

Lewis Lake Divide is fully snow-free, consistent with late-August seasonal norms. Because the reported SWE is 0.0" with no percent-of-median figure shown, this reflects the station's normal end-of-season condition — the median SWE for this date is also 0.0", meaning the station is not below normal for today's calendar position. The meaningful 2026 snowpack story is one of timing, not current deficit: the watershed melted out 4–6 weeks ahead of the historical median meltout date, driven by the anomalous March heat wave. New snowpack accumulation will not begin in earnest until October at the earliest. For Minidoka County irrigators, the practical implication is that no remaining snowmelt contribution to Snake River flows should be anticipated — current streamflow is driven entirely by reservoir releases and baseflow, not active snowmelt.

Streamflow Conditions

Snake River near Minidoka at Howells Ferry (USGS 13081500) — August 24, 2026:

7,580 cfs | Trend: Stable

The Howells Ferry gauge is the county's primary upstream supply indicator, capturing Snake River conditions across approximately 15,700 square miles of drainage area before water reaches Minidoka Dam and Lake Walcott. At 7,580 cfs with a stable trend, the Snake River is delivering consistent flow to the Minidoka pool as of this reporting date. This gauge functions as the leading indicator for supply conditions that will propagate downstream through Milner Dam and into the Twin Falls, Jerome, and Cassia county diversion systems — Minidoka County irrigators see these conditions first in the chain. With snowmelt contribution exhausted for the season, sustained flow at this gauge reflects upstream storage release management. Potato harvest and sugar beet harvest are entering or approaching peak water demand periods — late-season flow reliability at this gauge is the defining supply question for the remainder of the season.

Seasonal Guidance

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

Data Sources: SNOTEL data through August 23, 2026; USGS streamflow data through August 24, 2026

Data Current As Of: August 24, 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 your local water district, USBR Pacific Northwest Region (Boise office), Minidoka Irrigation District, Idaho Department of Water Resources (Water District 36), and USBR for American Falls Reservoir and Palisades Reservoir upstream context before making operational or regulatory decisions.