Freestone · Mixed · Colorado, US

Arkansas River — Bighorn Sheep & Royal Gorge (Cotopaxi to Parkdale)

Rocky canyon stretch of the Arkansas River in Royal Gorge, Colorado, with whitewater rapids breaking over boulders.

Down through Bighorn Sheep Canyon and into the Royal Gorge the Arkansas is bigger, lower, and warmer than the high water up at Granite, and it behaves differently for it.

Tomorrow · A proper day on the water
Sex Dungeon
Forecast · Tomorrow
A proper day on the water
A proper day for it. Work the seams with an upstream nymph, switch to the dry when they show.
65% projected
Today's fly
SD
Sex Dungeon
Conditions on the water · Tomorrow
Live gauge
Level
Rising
0.71 m
Lifting fast
Water temp14.1°C
ClarityVery coloured
Weather18°C
WindN 10 km/h
Pressure1016 hPa
Rain · recent0.2 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 Rainbow Trout
Ideal
14°C est.ideal 10–18°C
0°14°28°
How to fish it · for Rainbow 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 time of day could be better.
Likely species
Mayflies
Caddisflies
Hatch timeline · tomorrowPeak at 11am

12pm(now) — Reed Smut

Stage: On emergersApproach: Emerger or dryActivity: 39%
Also:Mahogany Dun38%Flying Ants22%
Peak emergence window4 food groups active

Peak activity at 11am — Reed Smut (Reed Smut, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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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
Brown DunHatch
2
3
3
3
3
3
3
2
Western Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2
Mahogany DunHatch
2
2

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

Ranked for today
Rainbow Trout fly box
SD
Sex Dungeon
2-6 · Pattern
Proven pattern for this period
Permits & access
Permit required — see local rules.
  • Colorado licence
  • Gold Medal reach (down to the US-50 bridge at Parkdale)
  • Verify CPW rules.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
South Platte — Eleven Mile Canyon
51 km
Rainbow trout · Brown trout
Arkansas River — Browns Canyon (Buena Vista to Salida)
52 km
66
Brown trout · Rainbow trout
South Platte — Dream Stream (Spinney to Eleven Mile)
60 km
Rainbow trout · Brown trout
Gallery · 2
  1. Rocky canyon stretch of the Arkansas River in Royal Gorge, Colorado, with whitewater rapids breaking over boulders.
    Arkansas River (Royal Gorge, west of Canon City, Colorado, USA) 4
  2. Terrain map of the venue
    Terrain map
About this water

Down through Bighorn Sheep Canyon and into the Royal Gorge the Arkansas is bigger, lower, and warmer than the high water up at Granite, and it behaves differently for it. Early season and autumn are the times here — browns and rainbows in a long, rock-walled freestone that holds good fish but heats up fast once July arrives. This is the reach where the thermal-welfare call gets real: a warm low-water afternoon down in the canyon is a poor choice for the trout, regardless of what the calendar says. Go early or go higher up the river.

  • Mixed
Water quality · US Clean Water Act
  • Aquatic life: Supporting
What this classification means

EPA ATTAINS assessment unit 'Arkansas River, all tributaries. Newlin Creek, Mineral Creek, Adobe Creek, and Oak Creek, mainstems and all tributares' (COARUA14e_A), 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) · COARUA14e_A

The full read · show the working · for Rainbow Trout · confidence 90%
How the 82 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time60 × 13%7.8
Pressure75 × 7%5.3
Insect activity64 × 12%7.7
Conditions total= 82
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 January → 31 December
Related guides
Euro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts