Minidoka County, Idaho — Water Intelligence Brief

August 10, 2026 | Free-Tier Edition

Situation Summary

Minidoka County enters the heart of potato and sugar beet season with Snake River flows at Howells Ferry running at 9,310 cfs — a mid-August baseline shaped by a 2026 snowpack season that melted out 4–6 weeks ahead of the historical median meltout date across the upper Snake River watershed. Lake Walcott storage and Minidoka Dam operational status are the county's defining supply variables for the remainder of the irrigation season; current storage figures and 7-day forecast details are available in the full brief. Irrigators and dairy operators should monitor upstream conditions closely, as Howells Ferry flows are the leading indicator for supply conditions that will propagate downstream through Milner Dam and the broader Magic Valley corridor.

Snowpack Conditions

Lewis Lake Divide (SNOTEL Station) — August 9, 2026

Current snow water equivalent: 0.0 inches | Snow depth: 0.0 inches

Lewis Lake Divide is fully snow-free, which is the expected and normal condition for this station on this date — the August median SWE is also 0.0 inches, so no below-normal signal exists in today's reading. The meaningful 2026 snowpack story is one of timing, not current deficit: this station and others across the upper Snake River watershed melted out approximately 4–6 weeks ahead of the historical median meltout date, driven by an anomalous heat event in March 2026. That early meltout means the peak runoff pulse that fills Lake Walcott and charges Snake River flows through June has already passed. The snowpack recharge window for the 2026 season is closed. Minidoka County's remaining irrigation season supply now depends entirely on what is stored in Lake Walcott, what continues to flow at Howells Ferry from upper basin releases and groundwater contributions, and how ESPA spring discharge sustains baseflows through September and October.

Streamflow Conditions

Snake River near Minidoka at Howells Ferry — USGS 13081500 | August 10, 2026

Current flow: 9,310 cfs | Trend: Stable

Howells Ferry is the primary upstream supply gauge for Minidoka County and the leading indicator for the entire Magic Valley corridor. At 9,310 cfs and holding stable, flows are delivering a functional mid-August supply signal — neither in freefall nor unusually elevated for this point in the season. This gauge drains approximately 15,700 square miles of the upper Snake River basin, integrating releases from American Falls and Palisades reservoirs upstream, along with ESPA groundwater discharge contributions that sustain Snake River baseflows through the late summer. The stable trend is operationally relevant: it suggests no immediate supply shock is propagating downstream toward Minidoka Dam. However, irrigators should note that August and September historically bring continued flow decline as upstream reservoir releases taper and irrigation demand remains high across potatoes, sugar beets, and alfalfa. Howells Ferry flows today represent the water supply picture before Milner Dam diversions — conditions at this gauge are the early warning system for what downstream counties will experience weeks later.

Seasonal Guidance

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Data Sources: SNOTEL data through August 9, 2026; USGS streamflow data through August 10, 2026.

Data Current As Of: August 10, 2026. 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.