Water Intelligence Brief · Archive

Mesa County, CO

September 28, 2026

Mesa County Water Intelligence Brief

September 28, 2026 | Colorado River Basin (Upper)

Situation Summary

Colorado River flows near Cameo are running at 1,390 cfs and falling, signaling a typical late-September taper that irrigators should factor into end-of-season delivery planning this week. The Uncompahgre River at Colona is holding stable at 144 cfs, providing modest but reliable late-season flow for users in the broader basin. Reservoir storage data and 7-day forecast details are available in the full brief.

Snowpack Conditions

SNOTEL stations across the Grand Mesa and surrounding terrain are showing conditions consistent with normal late-September conditions — snowpack accumulation has not yet begun at most sites.

  • Idarado: 0.1" SWE, 0.0" snow depth (September 27)
  • Mesa Lakes: 0.1" SWE, 0.0" snow depth (September 27)
  • Park Cone: 0.3" SWE, 0.0" snow depth (September 27)
  • McClure Pass: Data collection issues; no current reading available

    • No percent-of-median figures are reported at these stations, which reflects that the historical median SWE for this calendar date is also 0.0" — stations are at normal seasonal condition for late September, not below normal. As background context, 2026 was characterized by an anomalous March heat wave that caused snowpack to melt out 4–6 weeks ahead of the historical median meltout date — a condition that shaped the earlier irrigation season but is not the operative story at this point in the calendar.

    Streamflow Conditions

    Active gauge readings across the basin show a mixed picture of falling mainstem flows and stable tributary conditions:

  • Colorado River near Cameo: 1,390 cfs, falling (September 28) — the primary mainstem indicator for Mesa County. The falling trend is consistent with late-season recession as irrigation demand winds down and snowmelt contributions are absent.
  • Uncompahgre River at Colona: 144 cfs, stable (September 28) — holding steady, suggesting relatively consistent tributary inflows for this point in the season.
  • Gunnison River near Grand Junction: No recent flow data available.
  • Plateau Creek near Cameo: No recent flow data available.

    • The absence of current data from the Gunnison River and Plateau Creek gauges represents a meaningful monitoring gap. Irrigators drawing from those systems should contact the Colorado Division of Water Resources or their local ditch company for current delivery conditions until gauge data is restored.

    Seasonal Guidance

  • Contact the Colorado River Water Conservation District (Glenwood Springs) to monitor late-season call conditions and water availability for any remaining irrigation needs on the Colorado River mainstem.
  • Check with Colorado Division of Water Resources, Water Division 5 (Grand Junction office) for current water rights administration status and any active curtailment orders affecting Mesa County diversions.
  • Reach out to the Grand Valley Water Users Association or your local ditch company to confirm end-of-season delivery schedules and canal shutdown timelines.
  • Monitor the USGS National Water Information System (waterdata.usgs.gov) for restoration of Gunnison River and Plateau Creek gauge data, which are currently reporting no recent flow readings.

    • 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: 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, Western Colorado Area Office, and Colorado Division of Water Resources for regulatory decisions and water rights administration.

    Data & Disclaimers

    Sources: NRCS SNOTEL network · USGS National Water Information System · National Weather Service

    This brief provides automated analysis for informational purposes only. Consult official sources including your local water district and state Division of Water Rights for regulatory decisions. This document does not constitute legal, regulatory, or engineering advice.

    Other Issues

    Mesa County Brief — October 26, 2026Mesa County Brief — October 19, 2026Mesa County Brief — October 12, 2026Mesa County Brief — October 5, 2026Mesa County Brief — September 21, 2026Mesa County Brief — September 14, 2026Mesa County Brief — September 7, 2026Mesa County Brief — August 31, 2026Mesa County Brief — August 24, 2026Mesa County Brief — August 17, 2026Mesa County Brief — August 10, 2026Mesa County Brief — August 3, 2026Mesa County Brief — July 27, 2026Mesa County Brief — July 20, 2026Mesa County Brief — July 13, 2026Mesa County Brief — July 6, 2026Mesa County Brief — June 29, 2026Mesa County Brief — June 22, 2026Mesa County Brief — June 15, 2026Mesa County Brief — June 8, 2026Mesa County Brief — June 3, 2026Mesa County Brief — May 26, 2026Mesa County Brief — May 15, 2026Mesa County Brief — April 27, 2026

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