Weld County Water Intelligence Brief

September 7, 2026 | Water Division 1 | South Platte Basin

Situation Summary

Flows on both the South Platte and Cache la Poudre are falling heading into the final weeks of the 2026 irrigation season, tightening supply conditions for junior direct-flow right holders and increasing pressure on C-BT supplemental deliveries across northern Weld County. With the Poudre reading 11 cfs at Fort Collins and 9 cfs above Boxelder Creek near Timnath, and the South Platte at 124 cfs at Fort Lupton, late-season reliability for junior appropriators is the central concern this week. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

All three SNOTEL stations monitoring the Cache la Poudre headwaters are reporting 0.0" snow water equivalent (SWE) and 0.0" snow depth as of September 6 — a normal seasonal condition for early September, when the historical median SWE at these elevations is also 0.0". No below-normal language applies to current readings.

The relevant 2026 context is timing: Deadman Hill, Hourglass Lake, and Joe Wright all melted out 4–6 weeks ahead of the historical median meltout date, driven by an anomalous March heat wave. That early meltout accelerated spring runoff into May and June, pulling forward the pulse of snowmelt-derived streamflow that Poudre irrigators depend on through summer. By September, that supply pulse is long past. South Platte basin headwaters snowpack — including Blue River and upper Platte canyon stations that feed Carter Lake and the broader mainstem — is not directly monitored by these three stations; Northern Water and Water Division 1 remain the appropriate contacts for upstream South Platte basin supply context.

Streamflow Conditions

Cache la Poudre River: The Fort Collins gauge is reading 11 cfs (falling) and the above-Boxelder Creek gauge near Timnath — the closest active monitoring point to where the Poudre enters Weld County — is reading 9 cfs (falling) as of September 7. These are very low late-season flows. At 9–11 cfs, the Poudre is carrying a fraction of its seasonal peak capacity. Junior direct-flow right holders on the lower Poudre face a high likelihood of curtailment or continued curtailment under active Water Division 1 administration. Senior Poudre rights dating to the 1860s–1870s hold priority under these conditions.

South Platte River: The Fort Lupton gauge is reading 124 cfs (falling) as of September 7. While substantially higher in absolute volume than Poudre flows, the falling trend on the mainstem reflects the same post-peak seasonal pattern. Irrigators with junior direct-flow rights on the South Platte mainstem should monitor call status closely, as declining flows increase the probability that senior downstream rights will be placed in priority. Return flow dynamics on the lower South Platte add complexity: as upstream irrigation activity winds down, the return flows that supplement downstream senior rights also diminish — a compounding factor in late-season administration.

Both gauges are on a falling trend, and no near-term natural recharge from snowmelt is anticipated given current headwater conditions.

Seasonal Guidance

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Data Sources: SNOTEL data through September 6, 2026; USGS streamflow data through September 7, 2026

Data Current As Of: September 7, 2026 | 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 — northernwater.org; Horsetooth Reservoir data via Northern Water portal 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.