Headwaters of the Segura in the Sierra de Segura mountains. Cold limestone water with wild brown trout. Shares mountain character with the adjacent upper Guadalquivir system. No pike in the upper trout-bearing reaches.
- Limestone
Water temperature for brown trout
Warm — slow19°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
⚠️ Water at 18.5°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — river flow is in the right range.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 8 active hatches hour by hour 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 · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
1
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.
- Junta de Andalucía licence required
- Check current tramo status.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Water here around 19°C — probably warm enough to stress brown trout. These are likely cooler.
About this water
The full read · show the working · for brown trout · confidence 80%
How the 37 is built — score × weight = contribution
Temperature47 × 28%13.2
Flow95 × 22%20.9
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity64 × 12%7.7
Conditions total= 74
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Directions
Related guides
Booking & contacts
Upper Segura
Terrain map
Headwaters of the Segura in the Sierra de Segura mountains.
Water temperature for brown trout
Warm — slow19°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
⚠️ Water at 18.5°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — river flow is in the right range.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 8 active hatches hour by hour 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 · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
1
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.
- Junta de Andalucía licence required
- Check current tramo status.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Water here around 19°C — probably warm enough to stress brown trout. These are likely cooler.
About this water
Headwaters of the Segura in the Sierra de Segura mountains. Cold limestone water with wild brown trout. Shares mountain character with the adjacent upper Guadalquivir system. No pike in the upper trout-bearing reaches.
- Limestone
The full read · show the working · for brown trout · confidence 80%
How the 37 is built — score × weight = contribution
Temperature47 × 28%13.2
Flow95 × 22%20.9
Clarity95 × 18%17.1
Feeding Time70 × 13%9.1
Pressure80 × 7%5.6
Insect activity64 × 12%7.7
Conditions total= 74
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Directions
Related guides
Booking & contacts