Gunnison River
Black Canyon · Blue Mesa Tailwater
W Colorado, USA
Open live forecast →Target species: Brown and Rainbow.
Stream gauge: 09114500. Flow and water temperature update on every refresh.
Weekly AI Outlook as of 10/02/26
At 240 cfs, the Black Canyon tailwater is running low and clear — ideal wading conditions for technical dry-dropper and nymph work. Water at 48.7°F is right on the edge of the BWO trigger zone; expect Baetis to come off midday once air temps climb into the mid-60s, typically 11am–2pm on these October afternoons. With highs forecast in the upper 60s to low 70s and no precipitation in the window, midday hatches could be consistent and fishable all four days. No recent shop intel — this outlook is built on current conditions alone. Focus on RS2 and CDC Emergers in #20–22 during the hatch window; before bugs appear, small nymphs tight to structure in slower seams will be your best play on these pressured browns and rainbows.
- Flow: 240 cfs — low and clear, excellent wading. Tailwater release is stable with no precip in the forecast; expect consistent conditions through the weekend.
- Hatches: BWO (Baetis) is peak month. Look for midday emergence 11am–2pm as air temps warm. RS2 and CDC Emergers #20–22 are the go-to patterns.
- Water Temp: 48.7°F — just below the 50°F caddis threshold. Baetis activity will be driven by afternoon light and air temp warming, not water temp shifts.
- Best Window: 11am–2pm for BWO dry-fly action. Morning nymphing with small Baetis patterns in slower seams before the hatch develops. Wind picks up by afternoon — fish early if it's gusting.
Generated weekly from live USGS gauge readings, weather forecasts, and recent fly shop reports. Updates Friday mornings.
About this Water
- Freestone
- Best months: May–Oct, peak June (salmonfly) & Aug–Sept
The Gunnison River through Black Canyon and the Gunnison Gorge is one of the most dramatic trout fisheries in North America — a deep, narrow canyon cut through dark Precambrian rock, with pocket water, plunge pools, and big trout that rarely see anglers. The Gold Medal water section produces large rainbows and browns. The Gunnison Gorge below Black Canyon National Park requires a hike-in or raft-in approach; the river above through the Almont stretch is more accessible. Stonefly hatches in early summer are exceptional.
Black Canyon of the Gunnison's walls reach 2,700 feet — the deepest narrow canyon in North America — making the trout water below among the most spectacular settings in fly fishing.
May Outlook
The Gunnison Gorge is one of Colorado's most dramatic fisheries — accessible only by foot or raft. As runoff clears, exceptional dry fly fishing emerges.
Productive Patterns
- PMD Sparkle Dun
- Elk Hair Caddis
- Stimulator
- Nymph
Tips
Floating the Gunnison Gorge is a multi-day wilderness experience. The walk-in sections via the Chukar, Duncan, and Ute trails require a 1.5-mile descent. Plan accordingly. The reward is solitude and world-class fishing.
Water Notes
High flows in early May dropping to 800–2,000 cfs by late May. The walk-in sections clear ahead of the floatable gorge.
June Outlook
Prime season in the Gunnison Gorge. Golden Stones, PMDs, Caddis, and Salmonflies create overlapping hatches on one of Colorado's most remote rivers.
Productive Patterns
- Salmonfly
- Golden Stone
- PMD
- Elk Hair Caddis
Tips
The gorge is remote and spectacular. Float trips require a shuttle and take 2–3 days. The walk-in sections are excellent for day trips. Fish are large — 18+ inch brown trout are common.
Water Notes
1,000–3,000 cfs in June. Cold 52–60°F. The Gunnison's Black Canyon creates a protected microclimate.
July Outlook
Excellent fishing throughout the Gunnison system. Hopper-dropper in the gorge and Taylor River sections.
Productive Patterns
- Hopper-Dropper
- PMD Cripple
- Elk Hair Caddis
- Golden Stone
Tips
The Gunnison in July is exceptional but the gorge is remote — plan accordingly with proper gear and permits. The walk-in sections are accessible for day trips.
Water Notes
600–1,500 cfs. Water 56–64°F. Outstanding summer wilderness fishing.
August Outlook
Hopper season in the gorge. The Gunnison's large browns aggressively take hoppers in the heat of August.
Productive Patterns
- Dave's Hopper
- Chubby Chernobyl
- Elk Hair Caddis
- PMD Cripple
Tips
The canyon shade keeps water temps comfortable even in August. Large brown trout in the gorge are aggressive hopper eaters. A memorable wilderness fishing experience.
Water Notes
500–1,000 cfs. Water 58–65°F — the canyon shade helps maintain comfortable temps.
September Outlook
Outstanding fall fishing in the Gunnison Gorge. Less pressure after summer and exceptional BWO and streamer activity.
Productive Patterns
- Blue Winged Olive
- Mahogany Dun
- Streamer
- Copper John
Tips
September in the Gunnison Gorge is spectacular. The large brown trout are at their most aggressive before spawning. Float trips in September are a highlight of Colorado fly fishing.
Water Notes
400–900 cfs. Water 52–60°F. Excellent fall wilderness conditions.
Hatch Calendar
| Insect | Peak | Active | Size | Productive Patterns |
|---|---|---|---|---|
| Blue Winged Olive Baetis tricaudatus |
Apr, Oct | Mar, Apr, May, Sep, Oct, Nov | #18–22 |
|
| Pale Morning Dun Ephemerella inermis |
Jul | Jun, Jul, Aug | #16–18 |
|
Access & Approach
Gunnison and Montrose are the primary bases. Gunnison Gorge requires hike-in (Chukar Trail) or float (permit required). Almont and Almont Triangle offer wade access. Colorado fishing license required; Gold Medal regulations apply in designated stretches.
Nearby Fly Shops
- Dragonfly Anglers
- RIGS Fly Shop
Regulations & License
Fishing in Colorado requires a current license. Always verify season dates, bag limits, and any special-regulation waters before you fish.
Colorado fishing regulations & license →
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About Current
Gunnison River conditions on Current combine real-time flow data (USGS, WSC, CDEC, CEHQ), weather, tide predictions, hatch probabilities calibrated to this specific water, and recent fly shop reports from the area.
Gunnison River is one of 245 hand-curated waters in Current. The app and web forecast also generate AI outlooks for any unlisted river, lake, or saltwater flat anywhere in the world — drop a pin or paste a name and Current produces a fresh seasonal outlook with weather, flow context, and recommended techniques.
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