Sevier County Water Intelligence Brief

August 31, 2026 | Sevier River Basin

Situation Summary

Late-season streamflow across the Sevier River Basin is mixed, with the upper system running at modest levels and mid-basin flows showing a rising trend near Kingston while the lower system near Lynndyl continues to fall. Irrigators in the final weeks of the summer season should expect tightening delivery margins as runoff contributions decline and late-season demand persists. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

Farnsworth Lake SNOTEL (08/30): Snow water equivalent 0.2", snow depth 1.0"

At Farnsworth Lake — the sole SNOTEL station in Sevier County's monitoring network — the late-August reading of 0.2" SWE and 1.0" snow depth reflects a remnant or early-season condition typical for this point in the calendar. No percent-of-median figure is reported for this date, which indicates the historical median SWE for late August is also effectively zero; the station is at a normal seasonal condition for this time of year, not below normal. As background context, the 2026 season was defined by an anomalous March heat wave that drove meltout 4–6 weeks ahead of the historical median meltout date across the Mountain West — a factor that shaped this season's early runoff timing and reservoir filling dynamics.

Streamflow Conditions

USGS Gauge Readings — August 31, 2026

| Gauge | Flow | Trend |

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

| Manti Creek blw Dugway Creek, nr Manti | 4 cfs | Stable |

| Sevier River at Hatch | 41 cfs | Stable |

| Sevier River near Kingston | 9 cfs | Rising |

| Sevier River near Lynndyl | 79 cfs | Falling |

| Sevier River near Sigurd | No recent data | — |

The Sevier River at Hatch, in the upper basin, is holding at 41 cfs with a stable trend — a relatively steady late-season reading for this reach. Moving downstream, the Kingston gauge registers 9 cfs with a rising trend, which is notable for late August and may reflect localized tributary input or operational releases; irrigators in the Kingston corridor should monitor this trend closely over the coming days. At the system's lower end near Lynndyl, flows of 79 cfs are falling, consistent with the late-season decline pattern typical for this time of year as upstream contributions wane.

Manti Creek below Dugway Creek is holding at 4 cfs in a stable condition — a modest but sustained flow for this tributary reach heading into September.

The Sevier River near Sigurd has no recent flow data available, creating a meaningful gap in the mid-basin picture. Users with irrigation interests in the Sigurd reach should seek local monitoring or direct communication with their water district to assess current conditions.

Seasonal Guidance

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