Tailwater · Mixed · Colorado, US

Gunnison River — Black Canyon & Gunnison Gorge

A narrow river flowing between towering dark canyon walls in the Gunnison Gorge, Colorado.

The Black Canyon is the Gunnison at its most serious — trophy browns and rainbows in a sheer, dark gorge you reach by a brutal hike down or a raft through, under National Park rules that mean exactly what they say.

Tomorrow · Not the day for it
Sowbug
Forecast · Tomorrow
Not the day for it
Not much stacked in your favour today. Worth an hour if you are nearby, not worth the special trip.
45% projected
Today's fly
Sowbug
Sowbug
Conditions on the water · Tomorrow
Live gauge
Level
Rising
0.49 m
Lifting fast
Water temp11.5°C
ClarityUnfishable
Weather19°C
WindN 9 km/h
Pressure1013 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Brown Trout
Ideal
12°C est.ideal 1016°C
0°14°28°
How to fish it · for Brown Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Excellent — water temperature is right today, though insect activity could be better.
Likely species
Hatch timeline · tomorrowPeak at 11am

12pm(now) Western Blue-Winged Olive

Stage: On emergersApproach: Emerger or dryActivity: 49%
Peak emergence window5 food groups active

Peak activity at 11am — Western Blue-Winged Olive (Western Blue-Winged Olive, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 3 with Pro.

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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
2
2
2
2
2
1
Western Blue-Winged OliveHatch
2
3
3
3
3
3
3
3
2
Pale Morning DunHatch
2
3
3
2
TricoHatch
2
3
2
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Colorado licence
  • NPS Black Canyon: flies/lures only, all rainbows C&R, brown limit 4, 200-yard closure below Crystal Dam
  • BLM Gunnison Gorge has its own rules
  • VERIFY NPS + BLM + CPW regs before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Gallery · 2
  1. A narrow river flowing between towering dark canyon walls in the Gunnison Gorge, Colorado.
    Places to Drop a Line, Gunnison River
  2. Terrain map of the venue
    Terrain map
About this water

The Black Canyon is the Gunnison at its most serious — trophy browns and rainbows in a sheer, dark gorge you reach by a brutal hike down or a raft through, under National Park rules that mean exactly what they say. Below it the Gunnison Gorge is BLM wilderness water, float-in trophy fishing of the kind people plan trips around. This is not a flatten-it-into-one-page fishery: the Park, the BLM gorge and the tailwater release each carry their own rules and risks. Flow comes off the Aspinall dams, the wading is genuinely dangerous, and the reward is some of the best big-trout water in Colorado for anglers willing to work and respect the regulations.

Under the surface

The Gunnison through the Black Canyon is less a river you fish than a place you descend into. The canyon is one of the steepest, narrowest, deepest in North America — walls of Precambrian gneiss and schist nearly black with age, dropping two thousand feet to a river you reach by a route with a name like the Gauging Station Trail and a warning about how much harder it is coming back up. The reward is a wild, powerful Gold Medal freestone of big browns and rainbows, plunging through boulder gardens and deep green pools in a slot where the sun reaches the water only a few hours a day. The bed is house-sized boulder and bedrock; the wading is genuinely dangerous and the crossings often impossible. This is a place for the fit, the careful and the slightly obsessed — which is to say, exactly the right kind of angler.

Wading: Dangerous boulder wading, brutal climb out

  • Mixed
  • Confined
  • Step pool
  • Pool riffle
Water quality · US Clean Water Act
  • Aquatic lifeSupporting
What this classification means

EPA ATTAINS assessment unit 'Gunnison River, all tributaries' (COGULG04a_J), 2024 Integrated Report. Aquatic Life use: Fully Supporting. This is a Clean Water Act assessment-unit classification (the US analogue of WFD), not a live reading.

Status is for the Clean Water Act assessment unit covering this reach.

EPA ATTAINS (Clean Water Act) · COGULG04a_J

The full read · show the working · for Brown Trout · confidence 90%
How the 86 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity59 × 12%7.1
Conditions total= 86
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
Directions
Seasons & zones
  • Trout 1 January31 December
Related guides
Booking & contacts