Washington County, UT — Water Intelligence Brief

July 13, 2026 | Free-Tier Edition | Virgin River Basin

Situation Summary

Washington County's water supply picture for mid-July 2026 reflects normal seasonal snowpack absence, with all monitored SNOTEL stations reporting zero snow water equivalent — as expected for this date — but with a critical timing caveat: the 2026 snowpack melted out 4–6 weeks ahead of the historical median meltout date, compressing the spring runoff pulse and reducing total seasonal recharge to Quail Creek and Sand Hollow reservoirs earlier than typical. Virgin River mainstem flows are currently supported by monsoon-season moisture and baseflow, but the abbreviated snowmelt window has implications for late-summer and fall municipal supply margins in one of the fastest-growing metro areas in the United States. Reservoir storage data, 7-day forecast details, and depletion rate analysis are available in the full brief.

Snowpack Conditions

All five SNOTEL stations monitoring the Virgin River basin headwaters report zero snow water equivalent and zero snowpack depth as of July 12, 2026 — the most recent available data. This is consistent with normal midsummer conditions for these elevations and does not indicate below-normal standing snowpack for this calendar date; median SWE for mid-July at these stations is also 0.0 inches.

Station readings (July 12, 2026):

The operationally significant snowpack signal for 2026 is not what these stations show today — it is when they melted out. An anomalous March heat wave drove meltout 4–6 weeks ahead of the historical median meltout date across the Mountain West, including the Virgin River basin headwaters. For WCWCD planners, this means the snowmelt recharge window that fills Quail Creek and Sand Hollow reservoirs concluded substantially earlier in the spring than normal years, with less time for reservoir operators to capture runoff before peak evaporative demand arrived.

Washington County's SNOTEL network is notably sparse relative to northern Utah counties. Five stations represent the monitoring foundation for the entire Virgin River basin headwater zone, and two stations (Kolob, Webster Flat) report no depth data. Water managers should acknowledge this coverage gap when interpreting snowpack-derived supply projections and consult NRCS Utah Snow Survey directly for interpolated basin-wide estimates.

Streamflow Conditions

Six active USGS gauges provide current streamflow data across the Virgin River basin in Washington County as of July 13, 2026. Flow patterns reflect the transition from snowmelt-dominated to monsoon-influenced hydrology, with several gauges showing rising or stable conditions consistent with early monsoon moisture input.

Gauge readings (July 13, 2026):

The Virgin River mainstem at Virgin (111 cfs, rising) and the combined North Fork (31 cfs, rising) and East Fork (40 cfs, stable) indicate active upper-basin flow that is currently above typical midsummer low-flow expectations. The rising trend on the North Fork and mainstem is consistent with early monsoon convective activity contributing to runoff — a pattern that can be episodic and unreliable as a planning basis but that supports near-term storage capture opportunities if WCWCD diversion infrastructure is positioned to take advantage.

The Santa Clara River system presents a notably different picture. The gauge at Pine Valley (4 cfs, stable) and the St. George gauge (2 cfs, falling) reflect the characteristically low baseflow of this smaller tributary system. The falling trend at St. George warrants monitoring, as the Santa Clara drainage serves portions of the Washington County metro area and feeds Gunlock Reservoir on the upper Santa Clara. Agricultural users in the Enterprise area and Hurricane Valley drawing on Santa Clara River tributary flows should note the limited available flow under current conditions.

For WCWCD operators, the Virgin River mainstem flows represent the primary opportunity for off-channel storage replenishment at Sand Hollow Reservoir via diversion. The early meltout timing makes monsoon-season capture increasingly important to seasonal water budgets.

Seasonal Guidance

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

Data Sources: SNOTEL data through July 12, 2026; USGS streamflow data through July 13, 2026.

Data Current As Of: July 13, 2026. Utah Division of Water Rights administrative data current as of publication date; verify current status at waterrights.utah.gov.

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 and Washington County Water Conservancy District (WCWCD), the primary water authority for Quail Creek and Sand Hollow reservoirs, for operational and regulatory decisions. Washington County lies within the Lower Colorado River Basin (Virgin River to Lake Mead, HUC 15); ongoing Colorado River Compact administration and Lower Basin shortage conditions are active supply planning factors. The Lake Powell Pipeline proposal remains dormant pending federal review and Colorado River system conditions — stakeholders should monitor WCWCD and Utah Division of Water Resources communications for updates. The Shivwits Band of Paiutes holds recognized water rights in Washington County water administration — consult the Utah State Engineer's Office for current adjudication context. Navajo Sandstone aquifer use should be verified through Utah Division of Water Rights before expanding groundwater pumping. This brief does not constitute legal, engineering, or water rights advice.