Rules at a glance
- Free fishing
- Fly only
Water temperature for Brown Trout
Ideal12°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 insect activity could be better.
Likely species
Mayflies
Mayflies
Caddisflies
Caddisflies- Tan Caddis / Spotted SedgeMost likelyLower confidenceNearest relative#14–16 · Adult
- Green Caddis / Rock WormAlso possibleLower confidence#14 · Adult
- October CaddisAlso possibleLower confidenceNearest relative#6–8–10 · Adult
- Little Black Caddis (East)Also possibleLower confidenceNearest relative#16–18–20 · Adult
Hatch timeline · todayPeak at 12pm
12pm(now) — Mahogany Dun
Stage: On emergersApproach: Emerger or dryActivity: 69%
Peak emergence windowDegree-days at peak5 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 3 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
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
Brown Trout fly box
2-6 · Pattern
Proven pattern for this period
Permits & access
Permit required — see local rules.
- Open all year (statewide default)
- Verify current UDWR gear/limit rules
- Native Colorado River cutthroat in the headwaters and tributaries are conservation-sensitive — handle with care
- Access lower down is complicated by irrigation diversions and private ground; fish verified public reaches and confirm before promoting any stretch.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
The full read · show the working · for Brown Trout · confidence 90%
How the 84 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time65 × 13%8.5
Pressure80 × 7%5.6
Insect activity63 × 12%7.6
Conditions total= 84
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
Seasons & zones
- Trout 1 January → 31 December
Related guides
Booking & contacts
Duchesne River
Water temperature for Brown Trout
Ideal12°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 insect activity could be better.
Likely species
Mayflies
Caddisflies
- Tan Caddis / Spotted SedgeMost likelyLower confidenceNearest relative#14–16 · Adult
- Green Caddis / Rock WormAlso possibleLower confidence#14 · Adult
- October CaddisAlso possibleLower confidenceNearest relative#6–8–10 · Adult
- Little Black Caddis (East)Also possibleLower confidenceNearest relative#16–18–20 · Adult
Hatch timeline · todayPeak at 12pm
12pm(now) — Mahogany Dun
Stage: On emergersApproach: Emerger or dryActivity: 69%
Peak emergence windowDegree-days at peak5 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 3 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 2 with Pro.
Start free trial14-day free trial. Cancel anytime.
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
Brown Trout fly box
2-6 · Pattern
Proven pattern for this period
Permits & access
Permit required — see local rules.
- Open all year (statewide default)
- Verify current UDWR gear/limit rules
- Native Colorado River cutthroat in the headwaters and tributaries are conservation-sensitive — handle with care
- Access lower down is complicated by irrigation diversions and private ground; fish verified public reaches and confirm before promoting any stretch.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
The full read · show the working · for Brown Trout · confidence 90%
How the 84 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time65 × 13%8.5
Pressure80 × 7%5.6
Insect activity63 × 12%7.6
Conditions total= 84
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
Seasons & zones
- Trout 1 January → 31 December
Related guides
Booking & contacts