Main western Pyrenean Ebro tributary crossing Aragón into Navarra. Key trout reaches sit around Yesa and the pre-Pyrenean corridor, where bigger-water nymphing and caddis-driven dry-fly windows define the main trout interest.
- Mixed
Water temperature for brown trout
Warm — slow16°C est.ideal 10–16°C
0°14°28°
How to fish it · for brown trout
When
Through the Navarrese trout season. Spring olives April through May; sedges through summer; small dark flies into the autumn close.
Where
Pool tails and the seams behind boulders through the upper Aragón valley. Pyrenean piedmont character — clear water, classic Iberian wild brown trout water.
Method
Upstream dry to risers; dry-dropper through the riffles. The Aragón runs clear Pyrenean water — long leader, fine tippet.
Kit
9 ft #4 — French freestone default. Floating line, 12 ft leader to 4 to 5 lb fluoro. Studded boots.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 3 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
Trout seasonSeason
1
1
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
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.
- Gobierno de Navarra fishing licence required
- Yesa reservoir regulates flow downstream, and the exact tramo and permit structure should be checked in the current official Navarra calendar before travel.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 1
Terrain map
About this water
The full read · show the working · for brown trout · confidence 55%
How the 0 is built — score × weight = contribution
Temperature93 × 28%26.0
Flow95 × 22%20.9
Clarity15 × 18%2.7
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity31 × 12%3.7
Limiting factor: Water is very coloured — too coloured for Brown Trout= 64
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout1 May → 30 June
Related guides
Booking & contacts
Río Aragón
Google Places
Main western Pyrenean Ebro tributary crossing Aragón into Navarra.
Water temperature for brown trout
Warm — slow16°C est.ideal 10–16°C
0°14°28°
How to fish it · for brown trout
When
Through the Navarrese trout season. Spring olives April through May; sedges through summer; small dark flies into the autumn close.
Where
Pool tails and the seams behind boulders through the upper Aragón valley. Pyrenean piedmont character — clear water, classic Iberian wild brown trout water.
Method
Upstream dry to risers; dry-dropper through the riffles. The Aragón runs clear Pyrenean water — long leader, fine tippet.
Kit
9 ft #4 — French freestone default. Floating line, 12 ft leader to 4 to 5 lb fluoro. Studded boots.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 3 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
Trout seasonSeason
1
1
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
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.
- Gobierno de Navarra fishing licence required
- Yesa reservoir regulates flow downstream, and the exact tramo and permit structure should be checked in the current official Navarra calendar before travel.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 1
Terrain map
About this water
Main western Pyrenean Ebro tributary crossing Aragón into Navarra. Key trout reaches sit around Yesa and the pre-Pyrenean corridor, where bigger-water nymphing and caddis-driven dry-fly windows define the main trout interest.
- Mixed
The full read · show the working · for brown trout · confidence 55%
How the 0 is built — score × weight = contribution
Temperature93 × 28%26.0
Flow95 × 22%20.9
Clarity15 × 18%2.7
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity31 × 12%3.7
Limiting factor: Water is very coloured — too coloured for Brown Trout= 64
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout1 May → 30 June
Related guides
Booking & contacts