Gooding County Water Intelligence Brief

July 6, 2026 | Free-Tier Edition

Situation Summary

Gooding County enters peak irrigation season with a snowpack-driven runoff pulse that is functionally complete — Galena Summit melted out 4–6 weeks ahead of the historical median meltout date, meaning the Big Wood River tributary contribution to the Snake River near Gooding has largely concluded earlier than normal. ESPA spring discharge, as reflected in the Malad River near Gooding, remains the critical water supply variable for Hagerman Valley trout aquaculture operators and is the most stable supply indicator in the county. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

Galena Summit (490:ID:SNTL) — July 5, 2026

Snow Water Equivalent: 0.0" | Snow Depth: 2.0"

Galena Summit, which monitors the Big Wood River headwaters in the Sawtooth Range, is reporting 0.0" SWE — consistent with normal seasonal conditions for this point in the calendar, as the historical median SWE for early July is also 0.0". This reading does not indicate a below-normal snowpack today; it reflects a station that has completed its seasonal melt cycle.

The critical signal for 2026 is timing: Galena Summit melted out approximately 4–6 weeks ahead of the historical median meltout date, driven by the anomalous March heat wave that accelerated snowmelt across the Mountain West. For Gooding County irrigators and Snake River corridor users, this means the Big Wood River's tributary contribution to Snake River flows near Gooding arrived earlier in the season and has been diminishing for weeks longer than a typical year. Alfalfa producers and dairy operators dependent on Snake River canal deliveries should treat the tributary runoff contribution from the Big Wood system as effectively complete for the 2026 season.

Streamflow Conditions

Malad River near Gooding, ID (USGS 13152500) — July 6, 2026

Flow: 247 cfs (falling)

The Malad River near Gooding is the primary indicator of ESPA spring discharge for the Hagerman Valley. Unlike snowmelt-driven tributaries, the Malad carries substantial flow from the Thousand Springs complex — the point where the Eastern Snake Plain Aquifer visibly emerges from the Snake River canyon walls as massive springs, one of the defining hydrological features of Gooding County and the Hagerman Valley.

At 247 cfs with a falling trend, the gauge is providing a current-season read on ESPA spring discharge rates. Because this flow reflects aquifer conditions rather than seasonal precipitation or snowmelt, the falling trend warrants attention from trout aquaculture operators in the Hagerman Valley. Commercial trout farms rely entirely on steady spring water delivery from ESPA discharge — they hold separate IDWR spring water appropriations distinct from canal irrigation rights and are not served by Milner Dam diversions. Any sustained decline in spring discharge rate is a direct operational variable for these facilities. Operators should track this gauge regularly and consult IDWR regarding their specific spring water appropriation status.

For Snake River canal irrigators — dairy operations and alfalfa producers receiving deliveries from the upstream Milner diversion infrastructure — the Malad reading provides context on ESPA contribution to Snake River baseflows in the western Magic Valley corridor. The early meltout timing at Galena Summit means the Big Wood River tributary pulse has concluded, placing greater relative weight on ESPA spring contributions and upstream storage releases for maintaining Snake River delivery capacity through the remainder of the irrigation season.

Seasonal Guidance

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Data Sources: SNOTEL data through July 5, 2026; USGS streamflow data through July 6, 2026

Data Current As Of: SNOTEL and USGS gauge data as of dates listed 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, Idaho Department of Water Resources (IDWR — administers Water District 36 for middle Snake River and tributary water rights, and 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 upstream storage context and regulatory decisions. Water rights administration decisions should be made in consultation with licensed water rights professionals and IDWR.