Water Intelligence Brief · Archive

Sanpete County, UT

September 7, 2026

Sanpete County Water Intelligence Brief

September 7, 2026 | Sevier River Basin

Situation Summary

Late-season streamflows across Sanpete County and the broader Sevier River Basin are declining, with Manti Creek registering only 3 cfs and falling — a signal that in-county irrigation supply is tightening as the season winds down. Sevier River readings at Kingston (8 cfs, falling) and Lynndyl (22 cfs, falling) confirm a basin-wide trend toward reduced late-season delivery capacity, with the anomalous early meltout in spring 2026 having left little residual snowmelt contribution this far into the season. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

All six SNOTEL stations reporting for Sanpete County and the surrounding Sevier River Basin show zero snow water equivalent (SWE) as of September 6, 2026 — consistent with normal conditions for this point in the calendar year, when median SWE at these elevations is also 0.0". This is not a below-normal reading for today's date.

Station Readings (September 6, 2026):

Beaver Dams: SWE 0.0", Snow Depth 0.0"

GBRC HQ: SWE 0.0", Snow Depth 1.0"

GBRC Meadows: SWE 0.0", Snow Depth 0.0"

Mammoth-Cottonwood: SWE 0.0", Snow Depth 0.0"

Mt. Baldy: SWE 0.0", Snow Depth 0.0"

Thistle Flat: SWE 0.0", Snow Depth 0.0"

The residual 1.0" snow depth at GBRC HQ with no measurable SWE likely reflects remnant firn or granular ice with negligible melt contribution. The operational story this week is not snowpack — it is what the basin-wide early meltout earlier this season means for remaining late-season streamflow. Stations across the Sevier River Basin melted out 4–6 weeks ahead of the historical median meltout date, compressing the window of snowmelt-driven streamflow and accelerating the transition to baseflow conditions. That transition is now complete. No additional snowmelt contribution to late-season flows should be expected.

Streamflow Conditions

Manti Creek below Dugway Creek, near Manti (the only active in-county USGS gauge), is running at 3 cfs and falling as of September 7. This is a low late-season reading that signals Sanpete County's primary in-county surface water system is delivering minimal volume. Irrigators relying on Manti Creek diversions should expect continued decline through the remainder of the season. No active USGS gauge exists on the San Pitch River mainstem — that is a known data gap. Contact Sanpete Water Conservancy District for additional local monitoring data beyond what the Manti Creek gauge captures.

The broader Sevier River Basin gauges provide important context:

Sevier River at Hatch, UT: 47 cfs, rising — the only gauge in the network currently trending upward. This upper-basin reading may reflect localized precipitation or tributary contributions upstream of Sanpete County, but it does not directly translate to improved supply conditions at county-level diversions.

Sevier River near Kingston, UT: 8 cfs, falling — a notably low reading on the mid-basin mainstem, reinforcing the declining trend through the Sevier's primary corridor.

Sevier River near Lynndyl, UT: 22 cfs, falling — the downstream signal, reflecting aggregate basin conditions heading toward Sevier Bridge Reservoir.

Sevier River near Sigurd, UT: No recent flow data available — this gauge should be monitored for restoration of reporting, as Sigurd sits between the Kingston and Lynndyl readings and fills an important mid-basin data gap.

The overall basin picture is one of declining late-season flows across nearly all active gauges. Turkey producers and ranchers dependent on hay and alfalfa irrigation through September should treat current delivery volumes as the ceiling, not a stable baseline — flows are trending downward at all reporting stations except Hatch.

Seasonal Guidance

Contact Sanpete Water Conservancy District to verify current local diversion schedules, any active distribution curtailments, and whether supplemental supply from Gunnison Reservoir or Piute Reservoir remains available for late-season deliveries.

Check current storage status for Piute Reservoir (serving Sanpete County users via the Sevier Valley–Piute Canal) directly with the Sevier River Water Users Association, as reservoir carry-over storage is a critical late-season buffer given declining streamflows.

Contact the Utah State Engineer's Office to confirm current water rights priority administration on the Sevier River system and whether any water right calls are active or anticipated as flows continue to decline.

Monitor USGS National Water Information System (waterdata.usgs.gov) for restoration of data at the Sevier River near Sigurd gauge, and check NRCS Utah Snow Survey for early-season snowpack outlooks that will inform 2027 planning.

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

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

Data Current As Of: Utah Division of Water Rights

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, U.S. Bureau of Reclamation, and Utah Division of Water Rights for regulatory decisions and water rights administration.

Data & Disclaimers

Sources: NRCS SNOTEL network · USGS National Water Information System · National Weather Service

This brief provides automated analysis for informational purposes only. Consult official sources including your local water district and state Division of Water Rights for regulatory decisions. This document does not constitute legal, regulatory, or engineering advice.

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