Stillwater · Limestone · Aragón, ES

Embalse de Arguis (Río Isuela coto deportivo)

Embalse de Arguis venue image

The most practical fly day from Zaragoza, and honest about what it is: a stocked coto on the Isuela reservoir under the limestone shoulders of the Sierra de Guara, an hour up the road from the city.

Fair · Rainbow
Grasshopper Pattern · 10-14
Fairlive now
Reasonable autumn fishing likely at Embalse de Arguis (Río Isuela coto deportivo)
Water temperature is the limiting factor today, not the wave. Fish dawn or dusk if you go at all, and handle everything with extra care.
56% confidence

Seasonally this is the right time to be here, but today's conditions are not doing Embalse de Arguis (Río Isuela coto deportivo) many favours. It can still fish, but temper expectations.

What moved it
  • WindSW 12 km/hGentle breeze
Today's fly
Grasshopper Pattern
Grasshopper Pattern10-14
Proven pattern for this period
Conditions on the water
Estimate
Wind
Gentle breeze
SW 12 km/h
N
SW
from the south-west
Wave20 cm ripple
Water temp22.3°C
Air temp32°C
CloudClear
Pressure1020 hPa
Rain · recent0.0 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

How to fish it · for Rainbow
When
Conditions are not ideal but fishable at Embalse de Arguis (Río Isuela coto deportivo). The ripple should help fish move and feed more confidently. Very warm conditions — trout have a narrower safe zone of cool, oxygen-rich water. Fish only at first light or last light, use barbless hooks, keep fish in the water during release, and stop if fish struggle to recover.
Where
Start with Griffith's Gnat (18-22) on a As per local method. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely.
The plan
Plan A

Start with Griffith's Gnat (18-22) on a As per local method. Rainbows respond to more active retrieves — try short strips between pauses. If that does not produce, switch depth or speed before changing the pattern entirely.

Plan B

A fry-imitating pattern stripped through the margins can save a blank in autumn.

Watch for

Keep an eye on changing conditions — wind shifts and cloud breaks can trigger short feeding spells.

Either bank or boat

Good ripple suits both bank and boat. Bank: work inflows, dam walls, and points. Boat: broadside drift covering wind lanes.

Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 with Pro.

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Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Lake OliveHatch
2
3
3
3
3
3
2
Daphnia SwarmHatch
2
3
3
3
2
Silverhorns & LonghornsHatch
1
2
2
2
1

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Rainbow fly box
Permits & access
Permit required — see local rules.
  • Aragón recreational licence plus the Arguis coto deportivo permit
  • Current rules include a single rod, bank-fishing only, restrictions near the dam/pasarela and no general boat fishing — confirm the live coto plan before planning a trip.
What's coming
Plan ahead
5-day outlook
Condition match
41%
Cloud25%
Wind65%
Temp25%

Conditions are away from Embalse de Arguis (Río Isuela coto deportivo)'s sweet spot — it usually fishes best in ripple wind with cloud skies.

Cooler water nearby · 2
Water here around 22°C — probably warm enough to stress Rainbow . These are likely cooler.
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

The most practical fly day from Zaragoza, and honest about what it is: a stocked coto on the Isuela reservoir under the limestone shoulders of the Sierra de Guara, an hour up the road from the city. Nobody will mistake it for a wild Pyrenean stream, but a stocked reservoir fished well on a buzzer or a slow nymph is a real day's fishing, and on a spring morning before the heat comes off the rock it can be a good one. Rainbows make up most of the stock; the odd brown turns up. It is the right answer when the mountain rivers are blown out, or simply too far for the hours you have.

  • Reservoir
  • Limestone
Why this score
  • High temperatures may push fish deeper and reduce surface activity.
Directions
Seasons & zones
  • Trout check current Arguis coto deportivo plancheck current Arguis coto deportivo plan

    Managed coto deportivo on the Isuela reservoir near Huesca: a coto permit is required in addition to the Aragón recreational licence. Dates, daily quotas and bank restrictions are set by the current coto plan, not by the river trout season — confirm before publishing booking-facing copy.

Related guides
Booking & contacts