Washington County, UT — Water Intelligence Brief

September 28, 2026 | Virgin River Basin | Municipal & Agricultural Supply

Situation Summary

Virgin River system flows are stable to rising this week, with the East Fork near Springdale running at 48 cfs, the North Fork at 38 cfs, and the mainstem at Virgin holding at 69 cfs — conditions that reflect end-of-monsoon season baseflow rather than snowmelt-driven supply. For the small agricultural community in Hurricane Valley and the Enterprise area, late-season delivery reliability is the operational question this week, while WCWCD municipal planners should note that Quail Creek and Sand Hollow reservoir replenishment from Virgin River diversions will be governed by these late-season flow levels through the autumn transition. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

All five SNOTEL stations reporting for the Virgin River basin headwaters show conditions consistent with normal late-September snowpack status — no measureable snow water equivalent or snow depth is present at this point in the calendar, and this is expected for this date.

| Station | SWE | Depth |

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

| Gardner Peak | 0.3" | 0.0" |

| Gutz Peak | 0.0" | 0.0" |

| Kolob | 0.0" | N/A |

| Long Valley Jct | 0.0" | 0.0" |

| Webster Flat | 0.0" | 0.0" |

The minor SWE reading at Gardner Peak (0.3") with no corresponding snow depth is likely an instrument artifact or trace residual and should not be read as meaningful accumulation. The network is effectively at zero, which is climatologically normal for late September in southwest Utah.

The more significant 2026 snowpack story is one of timing: across these stations, meltout occurred approximately 4–6 weeks ahead of the historical median meltout date, driven by an anomalous March heat wave that accelerated the snowmelt season basin-wide. That early meltout is now a background condition — it shaped summer streamflow and storage trajectories earlier in the season but is not the operative concern today. Washington County water managers and planners should note that southwest Utah's SNOTEL network is comparatively sparse relative to northern Utah basins, and high-elevation monitoring coverage in the Virgin River headwaters has meaningful gaps. NRCS Snow Survey data should be supplemented with WCWCD operational monitoring where available.

Streamflow Conditions

Virgin River basin gauges present a picture of late-season stability, with the mainstem and major forks holding near-steady flows that likely reflect residual monsoon moisture contributions and groundwater-supported baseflow.

Virgin River mainstem and forks:

The rising signal at La Verkin is a notable divergence from otherwise stable conditions and may reflect localized tributary input or late monsoon runoff — municipal and operational managers should monitor this gauge for trend continuation or reversal over the coming days.

Santa Clara River system:

The Santa Clara system is running at minimal levels, consistent with late-season low-flow conditions. The falling trend near Pine Valley warrants attention for any remaining agricultural diversions on the Santa Clara, including operations in the Enterprise area. At 2 cfs, available surface water on this system is limited.

For WCWCD planners, the Virgin River mainstem flows at Virgin (69 cfs) represent the primary surface water diversion opportunity for Sand Hollow and Quail Creek system recharge. Late-season flow at these levels is operationally meaningful but should be evaluated against existing diversion priorities and reservoir fill capacity.

Seasonal Guidance

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

Data Sources: SNOTEL data through September 27, 2026; USGS streamflow data through September 28, 2026.

Data Current As Of: September 28, 2026. Utah Division of Water Rights administrative data current as of brief publication date.

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, Washington County Water Conservancy District (WCWCD — primary water authority for Quail Creek and Sand Hollow reservoirs), Utah Division of Water Rights, and NRCS Utah Snow Survey for regulatory decisions and water rights administration. Washington County lies within the Lower Colorado River Basin (Virgin River to Lake Mead, HUC 15); Colorado River Compact obligations and federal shortage declarations affect long-term supply planning for this region. The Lake Powell Pipeline remains a dormant but policy-relevant proposal under ongoing federal review. The Shivwits Band of Paiutes holds recognized water rights in Washington County water administration and should be acknowledged in any formal planning processes. This brief does not constitute legal, engineering, or water rights advice.