Gooding County Water Intelligence Brief

October 26, 2026 | Snake River Basin (Magic Valley)

Situation Summary

Snake River irrigation deliveries are winding down for the 2026 season, and ESPA spring discharge — the water supply lifeline for Hagerman Valley trout aquaculture operations — is registering at 1 cfs on the Malad River near Gooding, with a rising trend as of October 26. For dairy operators and alfalfa producers, late-season canal deliveries are transitioning toward off-season groundwater reliance; trout farm operators should note the rising Malad signal as a positive indicator of current spring discharge stability. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

Two SNOTEL stations monitor snowpack relevant to Gooding County's tributary and regional water supply.

Galena Summit (490:ID:SNTL) — the primary headwaters indicator for the Big Wood River system — recorded 0.5" SWE at 62% of its 0.8" median as of October 25. With 3.0" of snow depth on the ground, early-season accumulation is underway but running below the median for this date. The Big Wood River drains from the Sawtooth Range through the Wood River Valley and enters the Snake River in the Gooding-area corridor; Galena Summit snowpack directly governs Big Wood tributary inflows to the Snake near Gooding. Below-median early accumulation here is worth monitoring as the season develops.

Lewis Lake Divide recorded 0.0" SWE and 0.0" snow depth as of October 25. No percent-of-median is shown, which indicates the median SWE for this date is also 0.0" — this station is at its normal seasonal condition for late October, not below normal. As context, the 2026 water year was marked by an anomalous March heat wave that drove meltout 4–6 weeks ahead of the historical median meltout date across the region — that event is now background history as new accumulation begins.

Streamflow Conditions

Malad River near Gooding (USGS 13152500): 1 cfs, rising, as of October 26.

This gauge is the primary indicator of ESPA spring discharge for the Hagerman Valley. Unlike snowmelt-driven rivers, Malad River flows are relatively stable year-round, reflecting Eastern Snake Plain Aquifer levels and Thousand Springs spring discharge rates rather than seasonal runoff patterns. The rising trend at 1 cfs is a positive signal for trout aquaculture operators who depend on steady spring water flow. Any sustained decline in this gauge — independent of season — would be the primary early-warning indicator of reduced ESPA spring discharge affecting Hagerman Valley trout farms. Current conditions appear stable.

Seasonal Guidance

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

Data Sources: SNOTEL data through October 25, 2026; USGS streamflow data through October 26, 2026

Data Current As Of: October 26, 2026

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, Idaho Department of Water Resources (IDWR — administers Water District 36, the middle Snake River and tributary water rights; also 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 — upstream context), for all regulatory decisions and water rights administration.