Freestone · Mixed · Colorado, US

Arkansas River — Browns Canyon (Buena Vista to Salida)

The Arkansas River flowing through a rocky streambed at sunset in Browns Canyon National Monument, Colorado, with pink and orange clouds reflected on the water.

Browns Canyon is the reach the caddis built — the Mother's Day hatch comes up the river in late April and May and the brown trout lose their manners for a couple of weeks, which is most of the reason people circle this water on the calendar.

Tomorrow · Slow going — pick your moments
Pheasant Tail
Forecast · Tomorrow
Slow going — pick your moments
Slow going — pick your moments and do not force it.
45% projected
Today's fly
Pheasant Tail
Pheasant Tail
Conditions on the water · Tomorrow
Live gauge
Level
Rising
1.05 m
Lifting fast
Water temp12.2°C
ClarityVery coloured
Weather16°C
WindN 4 km/h
Pressure1019 hPa
Rain · recent0.6 mm
Rain · ahead0.2 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 10–16°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 time of day could be better.
Likely species
Mayflies
Caddisflies
Hatch timeline · tomorrowPeak at 12pm

12pm(now) — Mahogany Dun

Stage: On emergersApproach: Emerger or dryActivity: 66%
Also:Reed Smut22%
Peak emergence windowDegree-days at peak6 food groups active

Peak activity at 12pm — Mahogany Dun (Mahogany Dun, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 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
ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

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
Brown 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
  • Verify CPW rules.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Arkansas River — Upper (Granite to Buena Vista)
44 km
Brown trout · Rainbow trout
South Platte — Dream Stream (Spinney to Eleven Mile)
49 km
Rainbow trout · Brown trout
Taylor River (below Taylor Park Reservoir)
50 km
0
Rainbow trout · Brown trout
Arkansas River — Bighorn Sheep & Royal Gorge (Cotopaxi to Parkdale)
52 km
Brown trout · Rainbow trout
South Platte — Eleven Mile Canyon
57 km
Rainbow trout · Brown trout
Gallery · 2
  1. The Arkansas River flowing through a rocky streambed at sunset in Browns Canyon National Monument, Colorado, with pink and orange clouds reflected on the water.
    Browns Canyon National Monument
  2. Terrain map of the venue
    Terrain map
About this water

Browns Canyon is the reach the caddis built — the Mother's Day hatch comes up the river in late April and May and the brown trout lose their manners for a couple of weeks, which is most of the reason people circle this water on the calendar. It's classic, accessible, wadeable freestone through Buena Vista and Salida, and it gets a crowd because it earns one. The catch is summer: this is also one of Colorado's busiest commercial whitewater runs, so a perfect hydrograph in July might still mean dodging rafts all afternoon. Fish the mornings.

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

EPA ATTAINS assessment unit 'Arkansas River, mainstem' (COARUA03_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) · COARUA03_A

The full read · show the working · for Brown Trout · confidence 90%
How the 83 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity63 × 12%7.6
Conditions total= 83
Can you trust it?
Water temperaturelive gauge readinggauge
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