Montrose County Water Intelligence Brief

October 26, 2026 | Colorado River Basin (Upper)

Situation Summary

Streamflows across the Uncompahgre Valley are active and rising this week, with the Uncompahgre River at Colona reporting 316 cfs (rising) and the Colorado River near Cameo at 1,850 cfs (rising), reflecting late-October runoff contributions. The Gunnison River below the Gunnison Tunnel is holding at 227 cfs (stable), providing a baseline read on Uncompahgre Project delivery conditions as the irrigation season winds down. Reservoir storage data for Blue Mesa and Ridgway — the upstream and in-county supply buffers that will define next season's delivery outlook — are available in the full brief.

Snowpack Conditions

Four SNOTEL stations are reporting early-season accumulation across the upper watershed, with mixed signals heading into late October.

Columbine Pass (10/25): 0.8" SWE, 1.0" snow depth. Idarado (10/25): 0.4" SWE, 0.0" snow depth — the depth reading of zero indicates the SWE is present in a very shallow, compacted layer; no percent-of-median context is provided, which means the historical median SWE for this date is also near zero, and this station is within its normal seasonal range. McClure Pass (10/25): 0.6" SWE at 299% of the 0.2" median — the standout reading in this dataset, indicating early-season accumulation notably above the historical median for this date, though absolute water content remains modest. Park Cone (10/25): 0.7" SWE, 2.0" snow depth.

As background context: the 2026 water year was defined by an anomalous March heat wave that drove snowpack meltout approximately 4–6 weeks ahead of the historical median meltout date across the Mountain West. That event shaped Blue Mesa inflow timing and Gunnison Tunnel delivery patterns through the spring and summer. The current snowpack readings represent a fresh start to the 2026–27 accumulation season. The McClure Pass reading above median is an early positive signal, but no conclusions about seasonal water supply should be drawn from late-October accumulation alone.

Streamflow Conditions

Colorado River near Cameo, CO: 1,850 cfs (rising) as of October 26. This mainstem reading reflects combined contributions from the upper Colorado system and is rising, consistent with late-season precipitation and possible early snowmelt pulses.

Gunnison River below Gunnison Tunnel, CO: 227 cfs (stable) as of October 26. This is the primary Uncompahgre Project delivery indicator — the Gunnison Tunnel (completed 1909, 5.8 miles) diverts Gunnison River water into the Uncompahgre Valley, and this gauge captures what remains in the Gunnison channel below that diversion point. A stable reading at this stage of October is consistent with end-of-season tunnel operations.

Uncompahgre River at Colona, CO: 316 cfs (rising) as of October 26. Rising conditions on the Uncompahgre reflect direct-flow contributions to this reach, relevant to Ridgway Reservoir operations and direct Uncompahgre River water users.

Gunnison River near Grand Junction, CO: No recent flow data available. Plateau Creek near Cameo, CO: No recent flow data available. Users requiring current data from these gauges should contact USGS or check the National Water Information System directly.

Seasonal Guidance

Subscribe for the full brief including reservoir storage, weather forecasts, depletion analysis, and detailed operational recommendations.

Data Sources: SNOTEL data through October 25, 2026; USGS streamflow data through October 26, 2026

Data Current As Of: October 26, 2026 | Prepared using Colorado Division of Water Resources service area information

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.