Weld County Agricultural Water Intelligence Brief

June 15, 2026 | Water Division 1 | South Platte Basin

Situation Summary

Weld County's two-river supply system — the South Platte mainstem and Cache la Poudre — is showing falling flows on both corridors as of June 15, reflecting the completion of an anomalously early snowmelt season driven by a March heat wave that pushed mountain snowpack out 4–6 weeks ahead of historical median meltout dates. With headwater snowpack exhausted and streamflows declining, the basin is transitioning to a late-season supply regime roughly a month and a half earlier than typical, placing C-BT supplemental supply and augmentation plan management at the center of operational planning for Weld County irrigators. Reservoir storage data, 7-day forecast details, and Water Division 1 call status analysis are available in the full brief.

Snowpack Conditions

All three SNOTEL stations monitoring Cache la Poudre headwaters in the Larimer County mountains — the primary snowpack source for northern Weld County surface water supply — are at or near zero snow water equivalent as of June 14, 2026, consistent with a fully concluded melt season.

Deadman Hill (06/14): SWE 0.1 inches, snow depth 0.0 inches. Trace SWE with no measurable snow depth indicates complete meltout has effectively occurred at this station.

Hourglass Lake (06/14): SWE 0.0 inches, snow depth 0.0 inches. No percent-of-median is reported, which indicates the median SWE for this date is also 0.0 inches — this station is at its normal seasonal condition for mid-June. The significant signal for 2026 is that Hourglass Lake melted out 4–6 weeks ahead of the historical median meltout date, not that today's reading is below normal.

Joe Wright (06/14): SWE 0.2 inches, representing 11% of the 1.8-inch median for this date. This is the one station in the network still carrying measurable SWE above zero, and it remains meaningfully below its historical median — the only station in this network for which below-normal language is appropriate today. Snow depth is 2.0 inches, suggesting remnant patchy snowpack at elevation, but this is not a meaningful supply reserve at this stage of the season.

The collective picture across all three Poudre headwaters stations is one of a snowpack season that has effectively concluded. The 2026 story is not what the readings show today — it is that these stations reached end-of-season conditions in late April or early May rather than mid-to-late June. That early meltout has already delivered the season's snowmelt pulse into the river system, and no further significant snowmelt-driven runoff contribution should be expected from the Poudre headwaters this season. South Platte basin headwaters snowpack — the Blue River corridor and upper Platte canyon systems that feed the Denver metro delivery infrastructure and ultimately the South Platte mainstem — is not directly monitored by these three stations and represents an additional upstream variable; C-BT allotment holders should consult Northern Water for that system's status.

Streamflow Conditions

Both river systems serving Weld County are showing falling flow trends as of June 15, confirming the post-runoff transition to base-flow conditions is underway across the basin.

Cache la Poudre River at Fort Collins (USGS 06752260, 06/15): 108 cfs, falling. This upstream Larimer County gauge reflects conditions entering the Poudre delivery corridor that serves northern Weld County irrigators and canal companies drawing from the Poudre system.

Cache la Poudre River above Boxelder Creek near Timnath (USGS 06752280, 06/15): 108 cfs, falling. The Timnath gauge is the closest active gauge to the Weld County line and is the most direct indicator of Poudre flows available to Weld County water users. The identical reading at both Poudre gauges, both on a falling trend, indicates relatively uniform flow through this reach with no significant intervening tributary input at this time.

South Platte River at Fort Lupton (USGS 06721000, 06/15): 152 cfs, falling. The Fort Lupton gauge is the primary active mainstem South Platte indicator within Weld County. Falling flows on the mainstem at this stage of the season reflect the same early-meltout dynamic seen in the snowpack record — the spring runoff pulse has already passed through the system.

The falling trend on both river systems simultaneously is the operationally significant signal for Weld County irrigators. As flows decline, the gap between available surface supply and senior appropriation demand narrows, increasing the likelihood that junior direct-flow rights holders will face curtailment under priority administration. C-BT allotment holders should be monitoring Northern Water delivery scheduling closely, as supplemental C-BT supply becomes increasingly important when river flows are declining and calls from senior downstream rights begin to intensify. Augmentation plan obligations also warrant close attention: as the South Platte and Poudre fall, the conditions under which out-of-priority well use triggers replacement obligations become more likely to be triggered.

Seasonal Guidance

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Data Sources: SNOTEL data through June 14, 2026; USGS streamflow data through June 15, 2026

Data Current As Of: Colorado Division of Water Resources

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, Northern Colorado Water Conservancy District (Northern Water — administers C-BT Project; Horsetooth Reservoir data via Northern Water portal at northernwater.org or USBR HydroMet site HRT), U.S. Bureau of Reclamation Eastern Colorado Area Office (Loveland, CO), and Colorado Division of Water Resources Water Division 1 (Greeley office) for regulatory decisions and water rights administration. This brief does not constitute legal or water rights advice.