Gooding County Water Intelligence Brief

August 31, 2026 | Free-Tier Edition

Situation Summary

Snake River canal deliveries and ESPA spring flows are sustaining late-season operations across Gooding County, with the Malad River near Gooding holding at 138 cfs — a stable reading that signals steady aquifer discharge supporting Hagerman Valley trout aquaculture through the final weeks of the irrigation season. Dairy operators and alfalfa producers should note that late August typically marks the transition toward reduced canal delivery reliability as seasonal Snake River flows decline and upstream storage drawdown continues. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

Both SNOTEL stations reporting for Gooding County's tributary watersheds show zero snow water equivalent as of August 30, consistent with normal late-summer conditions at this point in the calendar — the median SWE for these dates is also 0.0", so no below-normal signal exists today.

No additional snowmelt contribution to local streamflow should be expected from either station for the remainder of the 2026 irrigation season.

Streamflow Conditions

Malad River near Gooding (USGS 13152500): 138 cfs, stable — August 31

This is the defining water supply indicator for Gooding County's trout aquaculture sector. Unlike snowmelt-driven rivers, the Malad River near Gooding reflects Eastern Snake Plain Aquifer spring discharge from the Thousand Springs complex — where ESPA groundwater physically emerges from the Snake River canyon walls in the Hagerman Valley. The relatively stable 138 cfs reading is characteristic of ESPA-fed spring flow, which does not track seasonal precipitation the way surface-water streams do. For Hagerman Valley trout farm operators, stable Malad River flows indicate that ESPA spring discharge remains consistent at this time, which is the primary supply condition for operations holding IDWR spring water appropriations. Any meaningful decline in this gauge over weeks to months would warrant consultation with IDWR regarding spring water right administration.

For Snake River mainstem context — governing canal deliveries to dairy and alfalfa operations — inherited gauges at Milner Dam and Twin Falls provide the relevant upstream supply signal. Snake River flows in late August reflect a combination of upstream American Falls and Palisades storage releases and natural baseflow; with snowmelt complete across the basin, flows are sustained by managed releases. Dairy operators and alfalfa producers should monitor delivery schedules from their canal companies as the season approaches its final weeks.

Seasonal Guidance

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

Data Sources: SNOTEL data through August 30, 2026; USGS streamflow data through August 31, 2026

Data Current As Of: August 31, 2026. SNOTEL data provided by USDA Natural Resources Conservation Service (NRCS) National Water and Climate Center. Streamflow data provided by USGS National Water Information System.

Important Disclaimers: This brief provides automated analysis for informational purposes only. Specific numerical claims have not been independently verified. Consult official sources for regulatory and operational decisions, including: Idaho Department of Water Resources (IDWR — administers Water District 36 for middle Snake River and tributary water rights; also administers separate spring water appropriations for Hagerman Valley trout aquaculture and dairy operations; Eastern Regional Office, Pocatello, (208) 525-7161); 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 storage and Snake River operational context). This brief does not constitute legal, regulatory, or water rights advice. Water right priority and curtailment status must be verified directly with IDWR.