Gooding County, ID — Water Intelligence Brief

August 24, 2026 | Free-Tier Edition

Situation Summary

Gooding County enters late August 2026 under fully melted snowpack conditions across all monitored headwater stations, with the 2026 season defined by an anomalous March heat wave that drove meltout 4–6 weeks ahead of historical median timing — compressing the spring runoff window and reducing total tributary inflow to the Snake River corridor earlier in the season than typical. ESPA spring discharge, the defining water supply variable for Hagerman Valley trout aquaculture, is reflected in a stable Malad River reading at this time, providing a degree of supply continuity for spring-water-dependent operations. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

Both SNOTEL stations relevant to Gooding County's tributary watershed have completed seasonal meltout, consistent with normal conditions for late August.

Galena Summit (490:ID:SNTL) — August 23, 2026: Snow water equivalent (SWE) is 0.0 inches with a snow depth of 1.0 inch. No percent-of-median is reported, indicating the historical median SWE for this date is also 0.0 inches — the station is at a normal seasonal condition for this point in the calendar. Galena Summit is the primary headwaters monitor for the Big Wood River system, which drains south from the Sawtooth Range through the Wood River Valley and enters the Snake River in the Gooding-area corridor. The operationally significant signal for 2026 is not today's reading but meltout timing: Galena Summit melted out 4–6 weeks ahead of the historical median meltout date, meaning Big Wood River tributary contributions to the Snake peaked and receded substantially earlier than a typical year. Late-season Big Wood inflows to the Snake are now minimal.

Lewis Lake Divide (August 23, 2026): SWE is 0.0 inches with a snow depth of 0.0 inches. This station has fully melted out with no residual snowpack. No percent-of-median is reported, confirming this is a normal late-season condition for this date. No additional tributary contribution should be expected from this station's basin going forward in the 2026 irrigation season.

The practical implication for Gooding County irrigators and trout aquaculture operators is that no additional snowmelt-driven streamflow enhancement is available from any monitored headwater source for the remainder of the 2026 season.

Streamflow Conditions

Malad River near Gooding (USGS 13152500) — August 24, 2026: 142 cfs, reported as stable.

This gauge is the primary indicator of ESPA spring discharge for the Hagerman Valley and is the most operationally significant water supply signal for Gooding County's trout aquaculture sector. Unlike snowmelt-driven rivers, the Malad River's flow at this location reflects Eastern Snake Plain Aquifer water levels and Thousand Springs spring discharge rates rather than seasonal precipitation or meltout timing. The relatively stable reading at 142 cfs indicates that ESPA spring discharge into the Hagerman Valley is holding steady at this time — a positive supply continuity signal for trout farms holding IDWR spring water appropriations from the Thousand Springs complex.

Trout aquaculture operators should note that the stability of this gauge is the key indicator to monitor on an ongoing basis. A sustained declining trend in this reading would signal a reduction in ESPA spring discharge — the primary supply risk for spring-water-dependent operations — and would warrant immediate consultation with IDWR regarding water right status and ESPA aquifer conditions.

For Snake River canal irrigators — dairy operations and alfalfa producers receiving surface water deliveries — the Snake River mainstem context upstream at Milner Dam (13087995) and Twin Falls (13090500) provides the relevant delivery supply signal. Those gauges are the inherited indicators for Gooding County's position at the western end of the Magic Valley corridor. With both headwater SNOTEL stations fully melted out and no additional tributary inflow expected, late-season Snake River deliveries depend entirely on upstream reservoir releases and current mainstem flows.

Seasonal Guidance

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Data Sources: SNOTEL data through August 23, 2026; USGS streamflow data through August 24, 2026. Data provided by NRCS SNOTEL network (2 stations) and USGS National Water Information System (1 gauge).

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 and 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.