Gooding County Water Intelligence Brief

September 28, 2026 | Free-Tier Edition

Situation Summary

Snake River corridor deliveries are entering the final weeks of the 2026 irrigation season under late-season low-flow conditions, with ESPA spring discharge — the critical supply variable for Hagerman Valley trout aquaculture — holding at 83 cfs on the Malad River near Gooding as of today. Canal irrigators and dairy operations should be coordinating with their delivery districts for end-of-season scheduling, while trout aquaculture operators can monitor the Malad River gauge as the primary real-time indicator of ESPA spring flow stability. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

Both SNOTEL stations monitoring Gooding County's tributary watersheds are reporting seasonal end-of-season conditions consistent with normal late-September status.

Galena Summit (490:ID:SNTL) — the primary snowpack indicator for the Big Wood River system, which drains south from the Sawtooth Range and contributes tributary inflow to the Snake River in the Gooding area — recorded 0.0" snow water equivalent (SWE) and 1.0" snow depth as of September 27. At this point in the calendar, the median SWE at Galena Summit is also 0.0", so this station is at its normal seasonal condition. No below-normal signal is present for today's date. Context: the 2026 season was defined by an anomalous March heat wave that caused snowpack across the region to melt out 4–6 weeks ahead of the historical median meltout date — that early meltout drove the spring and summer supply trajectory but is now background history for late-September operations.

Lewis Lake Divide recorded 0.0" SWE and 0.0" snow depth as of September 27 — also consistent with normal late-season conditions.

New snowpack accumulation at these stations will be the signal to watch as October approaches, with Galena Summit the key leading indicator for Big Wood River tributary recovery heading into the 2026–27 water year.

Streamflow Conditions

Malad River near Gooding (USGS 13152500): 83 cfs, falling, as of September 28.

The Malad River near Gooding is the primary indicator of ESPA spring discharge for the Hagerman Valley. Unlike snowmelt-driven tributaries, the Malad carries significant discharge from the Thousand Springs complex — where the Eastern Snake Plain Aquifer emerges visibly from the Snake River canyon walls — and its flows reflect ESPA aquifer levels and spring discharge rates rather than seasonal precipitation or snowmelt timing. The relatively stable character of this gauge is what distinguishes it from all other streamflow indicators in the Magic Valley: trout aquaculture operators rely on that stability for year-round production continuity.

At 83 cfs with a falling trend, operators should note the directional signal. ESPA spring discharge is generally stable across seasons, so any sustained declining trend warrants attention and contact with IDWR for current aquifer monitoring context.

For Snake River mainstem context, Gooding County irrigators reference upstream gauges at Milner and Twin Falls — no active Snake River gauge is located within Gooding County itself.

Seasonal Guidance

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

Data Sources: SNOTEL data through September 27, 2026; USGS streamflow data through September 28, 2026.

Data Current As Of: September 28, 2026.

Important Disclaimers: This brief provides automated analysis for informational purposes only. Specific numerical claims have not been independently verified. Consult official sources including Idaho Department of Water Resources (IDWR — administers Water District 36 for middle Snake River water rights; administers separate spring water appropriations for Hagerman Valley trout aquaculture and dairy operations), Idaho Department of Fish and Game (co-manages Thousand Springs State Park area), and U.S. Bureau of Reclamation, Pacific Northwest Region (Boise office) for regulatory decisions and water rights administration.