Montrose County Water Intelligence Brief

September 28, 2026 | Colorado River Basin (Upper)

Situation Summary

Streamflows across Montrose County's key supply corridors are falling heading into the final days of the 2026 irrigation season, with the Gunnison River Below Gunnison Tunnel reading 218 cfs (falling) and the Uncompahgre River at Colona holding at 144 cfs (stable) as of September 28. For UVWUA irrigators and direct Uncompahgre diversions, late-season delivery conditions are tightening — users with remaining crop water needs should coordinate with their ditch company now to confirm allocation status before the season closes. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

All active SNOTEL stations in Montrose County's supply watersheds are reporting at or near their normal end-of-season baseline for late September:

Where stations show 0.0" depth with no percent-of-median figure, this reflects normal late-September conditions: the historical median SWE for this date is also 0.0", so these readings do not indicate below-normal snowpack for today's date. The relevant 2026 snowpack story is timing: area stations melted out approximately 4–6 weeks ahead of the historical median meltout date, driven by the anomalous March heat wave. That early meltout is the underlying driver of current streamflow and storage conditions — it is background context, not today's headline. New snowpack accumulation for the 2026–2027 season has not yet begun at these elevations.

Streamflow Conditions

Gunnison River Below Gunnison Tunnel, CO — 218 cfs (falling), 09/28

This gauge is the primary indicator of Uncompahgre Project delivery volume. At 218 cfs and trending downward, the tunnel is moving water but supply through this corridor is declining as late-season demand eases and upstream conditions reflect end-of-season runoff patterns. UVWUA irrigators should treat this as a closing-window signal for remaining crop applications.

Uncompahgre River at Colona, CO — 144 cfs (stable), 09/28

Flow on the Uncompahgre is holding steady, providing a modest late-season buffer for direct river users including those served by Ridgway Reservoir releases on the Uncompahgre corridor. Stability here is a relatively positive signal compared to the falling trend on the Gunnison Tunnel outlet.

Colorado River near Cameo, CO — 1,390 cfs (falling), 09/28

The mainstem Colorado at Cameo reflects aggregate basin conditions including Gunnison and tributary contributions. The falling trend is consistent with typical late-September seasonal recession across the Upper Colorado system.

Gunnison River near Grand Junction, CO — No recent flow data available.

Plateau Creek near Cameo, CO — No recent flow data available.

Users dependent on the Gunnison near Grand Junction or Plateau Creek corridors should contact the Colorado Division of Water Resources, Water Division 4 (Montrose office) directly for current conditions.

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. Water resources data sourced from NRCS SNOTEL network and USGS National Water Information System.

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, and Crystal reservoirs governing Gunnison Tunnel delivery; and Ridgway Reservoir on the Uncompahgre), Uncompahgre Valley Water Users Association (UVWUA), and Colorado Division of Water Resources, Water Division 4 (Montrose office) for regulatory decisions and water rights administration.