Freestone · Mixed · Colorado

Arkansas River — Upper (Granite to Buena Vista)

A metal truss bridge spanning the Arkansas River near Granite, Colorado, with mountains and pine trees in the background.

Up here above Buena Vista the Arkansas is a high, cold, tumbling freestone, and it fishes like one — pocket water and pucker-brush banks, browns mostly, with rainbows mixed in.

Prime · Brown Trout
Chubby Chernobyl · 6-10
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
  • LevelLiveTrend only — level not reported
  • Water temp12.4°C
  • ClarityClear
Today's fly
Chubby Chernobyl
Chubby Chernobyl6-10
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
Live
Trend only — level not reported
Water temp12.4°C
ClarityClear
Weather10°C
WindNW 7 km/h
Pressure1024 hPa
Rain · recent0.2 mm
Rain · ahead3.0 mm

Live readings only. Trends shown where the gauge supports them.

Water temperature for Brown Trout
Ideal
12.4°Cideal 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 insect activity could be better.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 2 active hatches hour by hour with Pro.

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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

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 · July 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 Green DrakeHatch
2
2
Flav (Small Western Green Drake)Hatch
2
3
2
Mahogany DunHatch
2
2
American March BrownHatch
2
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
  • Gold Medal reach (Lake Fork to Parkdale)
  • Verify CPW reach rules and watch for low-flow/temperature advisories.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
Taylor River (below Taylor Park Reservoir)
35 km
Rainbow trout · Brown trout
Arkansas River — Browns Canyon (Buena Vista to Salida)
44 km
Brown trout · Rainbow trout
South Platte — Dream Stream (Spinney to Eleven Mile)
54 km
Rainbow trout · Brown trout
Gallery · 2
  1. A metal truss bridge spanning the Arkansas River near Granite, Colorado, with mountains and pine trees in the background.
    Bridge across the Arkansas River
  2. Terrain map of the venue
    Terrain map
About this water

Up here above Buena Vista the Arkansas is a high, cold, tumbling freestone, and it fishes like one — pocket water and pucker-brush banks, browns mostly, with rainbows mixed in. The pre-runoff window in early spring can be the best secret in the state, right up until the snowmelt comes down out of the Sawatch and turns the whole thing to cold café-au-lait through May and June. Wait it out. When it drops and clears in July the dry-dropper fishing is honest and uncrowded, which up here counts for a lot.

  • 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 82 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 activity55 × 12%6.6
Conditions total= 82
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
  • Trout1 January → 31 December
Related guides
Euro Nymphingsubsurface methods
Booking & contacts