Gooding County Water Intelligence Brief

September 7, 2026 | Free-Tier Edition

Situation Summary

Snake River canal deliveries and ESPA spring discharge are both in late-season operational mode, with the Malad River near Gooding holding at 148 cfs — a stable reading that supports continued trout aquaculture operations in the Hagerman Valley as of this week. Dairy operators and alfalfa producers relying on Snake River irrigation should monitor delivery scheduling closely as the season winds toward shutdown, given that snowpack-driven tributary inflows from the Big Wood system are now exhausted for the year. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

Both SNOTEL stations reporting for Gooding County's primary tributary watershed show complete meltout, which is normal and expected for early September.

At this point in the calendar, 0.0" SWE reflects normal seasonal conditions — the median SWE for both stations on this date is also 0.0". The operational story is not current snowpack deficit; it is the legacy of early-season meltout that moved tributary contributions into the system weeks ahead of schedule and reduced late-summer inflow buffering.

Streamflow Conditions

Malad River near Gooding (USGS 13152500), September 7: 148 cfs, stable.

This is the defining gauge for Gooding County's water supply picture. The Malad River near Gooding is the primary indicator of ESPA spring discharge for the Hagerman Valley — its flow reflects the Thousand Springs complex, where Eastern Snake Plain Aquifer groundwater emerges from the Snake River canyon walls and discharges directly into the system. Unlike snowmelt-driven tributaries, this flow is relatively stable year-round, governed by aquifer level and spring discharge rate rather than seasonal precipitation or snowpack.

The current 148 cfs stable reading indicates steady ESPA spring discharge, supporting normal operational conditions for Hagerman Valley trout aquaculture this week. Trout farm operators holding IDWR spring water appropriations should note that any meaningful change in this gauge — rather than snowpack data or canal delivery schedules — is their primary supply signal.

For dairy operators and alfalfa producers on Snake River canal deliveries, the relevant mainstem context comes from upstream gauges at Milner and Twin Falls. The Big Wood River tributary contribution, governed by Galena Summit snowpack, is now seasonally exhausted.

Seasonal Guidance

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Data Sources: SNOTEL data through September 6, 2026; USGS streamflow data through September 7, 2026

Data Current As Of: September 7, 2026. SNOTEL data sourced from NRCS National Water and Climate Center. Streamflow data sourced from 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 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 and operational context. For water rights administration and regulatory decisions, contact IDWR directly.