Montrose County Water Intelligence Brief

September 7, 2026 | Colorado River Basin (Upper)

Situation Summary

Streamflows across the Uncompahgre Valley are falling heading into the final stretch of the irrigation season, with the Uncompahgre River at Colona running at 108 cfs and declining, and the Colorado River near Cameo at 840 cfs and falling. Gunnison Tunnel deliveries — the lifeblood of UVWUA's 76,000-acre service area — remain the critical variable to watch this week, as late-season demand for Olathe sweet corn, orchards, and hay acres continues against a backdrop of tightening late-summer supply. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

All four SNOTEL stations monitoring the upper watershed are reporting end-of-season conditions consistent with the normal September baseline — no active snowpack remains:

No percent-of-median figures are reported for these stations at this date, meaning the median SWE for early September is also effectively 0.0" — these readings reflect normal seasonal conditions for this point in the calendar, not a below-normal snowpack signal. The relevant 2026 snowpack story is one of timing: stations across this watershed melted out 4–6 weeks ahead of the historical median meltout date, driven by an anomalous March heat wave. That earlier-than-normal meltout is the upstream driver of current streamflow trajectories and reservoir conditions — the snowpack itself is no longer the active variable.

Streamflow Conditions

Flows across the county's primary gauges reflect late-season recession consistent with reduced snowmelt contribution:

The Gunnison River Below Gunnison Tunnel gauge is the primary delivery indicator for Uncompahgre Project irrigators. At 246 cfs and holding stable, tunnel deliveries are currently maintaining, though the falling trend on the Uncompahgre at Colona signals tightening conditions for direct Uncompahgre River users. The Uncompahgre at 108 cfs and declining is the gauge to monitor closely in the coming days. Upstream Blue Mesa Reservoir storage — not reflected in these flow numbers alone — governs the multi-week supply outlook for tunnel deliveries; Ridgway Reservoir provides a local buffer for Uncompahgre River users. Data gaps at the Grand Junction and Plateau Creek gauges limit full system visibility this week.

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: 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, U.S. Bureau of Reclamation (Aspinall Unit — Blue Mesa, Morrow Point, Crystal reservoirs governing Gunnison Tunnel delivery; and Ridgway Reservoir on the Uncompahgre), and Uncompahgre Valley Water Users Association (UVWUA) for regulatory decisions and water rights administration.