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.

Prime · Brown Trout
Parachute Adams · 16–20
Primelive now
About as good as it gets
Low and clear — careful approach country. Take your time — read the water before you cast.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp9.1°C
  • ClarityClear
Today's fly
Parachute Adams
Parachute Adams16–20
Proven pattern for this period
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp9.1°C
ClarityClear
Weather13°C
WindS 28 km/h
Pressure1013 hPa
Rain · recent1.6 mm
Rain · ahead7.2 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for Brown Trout
Cool — slow
9°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 clarity is right today, though time of day could be better.
Likely species
Gammarids
Hatch timeline · todayPeak at 9pm

Hatch predictions

Today's headline hatch shown — see all 8 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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Evidence
Records-basedModerate confidence

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

Through the year
0–3 scale · October 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
85
Brown trout · Rainbow trout
South Platte — Dream Stream (Spinney to Eleven Mile)
49 km
85
Rainbow trout · Brown trout
Taylor River (below Taylor Park Reservoir)
51 km
72
Rainbow trout · Brown trout
Arkansas River — Bighorn Sheep & Royal Gorge (Cotopaxi to Parkdale)
52 km
85
Brown trout · Rainbow trout
South Platte — Eleven Mile Canyon
57 km
85
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 80 is built — score × weight = contribution
Temperature84 × 28%23.5
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity72 × 12%8.6
Conditions total= 80
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