Freestone · Mixed · Aragón

Isábena

Stone arch bridge over the Isábena river with rocky riverbed, Huesca, Aragón

An eastern Aragonese tributary joining the Ésera system near Beranuy.

Poor · Brown Trout
Klinkhammer · 14-18
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
90% confidence
What moved it
  • Level0.22 mDropping after lift
  • Water temp23.2°C
  • ClaritySlightly colouredClearing
Today's fly
Klinkhammer
Klinkhammer14-18
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.22 m
Dropping after lift
Water temp23.2°C
ClaritySlightly coloured
Weather33°C
WindS 7 km/h
Pressure1018 hPa
Rain · recent6.3 mm
Rain · ahead5.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Brown Trout
Warm — slow
23°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 23.2°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 5 active hatches hour by hour with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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Evidence
Survey-backed · regionalHigh confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
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.
  • Aragón fishing licence required
  • Named cotos, social cotos, and special high-mountain sections can have different dates, permit allocations, and method rules, so check the current Aragón plan for the exact beat.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Probably above the Brown Trout safety line — these are likely cooler, but carry a thermometer.
Ésera
21 km
~17°C
Brown trout
Gallery · 2
  1. Stone arch bridge over the Isábena river with rocky riverbed, Huesca, Aragón
    The Isábena river near La Puebla de Roda, Aragón
  2. Terrain map of the venue
    Terrain map
About this water

An eastern Aragonese tributary joining the Ésera system near Beranuy. Mixed geology with limestone influence in lower reaches transitions to granite and slate in upper sections. Good wild-trout populations in the upper valley respond to technical presentation.

  • Mixed
The full read · show the working · for Brown Trout · confidence 90%
How the 2 is built — score × weight = contribution
Temperature1 × 28%0.3
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity46 × 12%5.5
Limiting factor: Water temperature (23.2°C) is outside Brown Trout's preferred range (10–16°C)= 52
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout check named Aragón coto or free section → check named Aragón coto or free section
Related guides
Pyrenees PlaybookSpanish riversEuro Nymphingsubsurface methods
Booking & contacts