Sanpete County Water Intelligence Brief

September 28, 2026 | Sevier River Basin

Situation Summary

Streamflows across the Sevier River Basin are running at late-season low levels, with Manti Creek at 2 cfs and Sevier River gauges ranging from 9 to 42 cfs — conditions consistent with the tail end of the irrigation season and signaling limited remaining surface water availability for Sanpete County turkey producers, ranchers, and hay growers. Irrigators should treat current deliveries as near-final for the 2026 season and plan accordingly for transition to winter water management. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

All six SNOTEL stations reporting for the Sanpete County area show 0.0" snow water equivalent (SWE) and 0.0" snow depth as of September 27, 2026 — the expected condition for this date, as historical median SWE at these stations is also 0.0" in late September. No below-normal framing is warranted for current readings.

| Station | SWE | Depth |

|---|---|---|

| Beaver Dams | 0.0" | 0.0" |

| GBRC HQ | 0.0" | 0.0" |

| GBRC Meadows | 0.0" | 0.0" |

| Mammoth-Cottonwood | 0.0" | 0.0" |

| Mt Baldy | 0.0" | 0.0" |

| Thistle Flat | 0.0" | 0.0" |

As background context: an anomalous March 2026 heat wave caused snowpack across these stations to melt out 4–6 weeks ahead of the historical median meltout date, which drove an earlier-than-normal peak runoff and accelerated seasonal streamflow decline. That event shaped this season's supply picture; the current zero readings reflect normal seasonal conditions, not an ongoing deficit.

Streamflow Conditions

Manti Creek below Dugway Creek near Manti — the only active in-county USGS gauge — is running at 2 cfs as of September 28, with flow characterized as stable. This is the primary in-county streamflow indicator for Sanpete County agricultural users. No active gauge exists on the San Pitch River mainstem; that remains a known data gap. Contact Sanpete Water Conservancy District for additional local monitoring context beyond what Manti Creek reflects.

Sevier River gauges in adjacent counties provide broader basin context:

The falling trend at Lynndyl and the absence of data at Sigurd are worth monitoring. Basin-wide, flows are at levels typical of late-season conditions — but with no snowpack accumulation yet underway and the 2026 early-melt season already having reduced total annual runoff, replenishment of system storage ahead of winter is not expected from current surface flows alone.

Seasonal Guidance

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Data Sources: SNOTEL data through September 27, 2026; USGS streamflow data through September 28, 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, Utah Division of Water Resources, and Utah Division of Water Rights for regulatory decisions and water rights administration.