Freestone · Limestone · Aragón

Aragón Subordán

The Aragón Subordán flows through the dramatic Hecho valley before joining the main Aragón.

Huesca (provincia), rápidos 1993 01

LBM1948 (https://commons.wikimedia.org/wiki/User:LBM1948) - CC BY-SA

Likely too hot — check on arrivalThe water is probably above the brown trout safety line — carry a thermometer.

Water estimated at about 22°C from air temperature — there is no water-temp gauge here, so treat the figure as a guide. If the estimate is right, this is above 22°C and you should not be targeting brown trout. But shade, cold tributaries, and recent rain can hold a river two or three degrees below the air-driven figure. Carry a thermometer. Check it on arrival. If the river is genuinely at 22°C or above, fish another species or come back another day. If it is cooler than the estimate: dawn and dusk only, barbless hooks, land it fast, wet hands, no air shots. Stop the moment a fish is slow to recover.

DepthShaded riffles, deep pools, spring inflows, cold tributary mouths. That is where the fish will be.
TimingDawn and dusk only. Nothing in the middle of the day.

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

Notify when prime

What moved it

LevelDry recentlyNo gauge reading
Water temp22.1°C
ClarityClear

Today’s fly

Klinkhammer14-18

High-confidence seasonal pick

Live now

Conditions on the water

Estimate

Trends shown where the gauge supports them

Level

Dry recently

No gauge reading

Water temp

22.1°C

coldwarm

Clarity

Clear

Weather

24°C

Clear

Wind

SE 8 km/h

calmblown out

Pressure

1017 hPa

lowhigh

Rain · recent

0.0 mm

dryspate risk

Rain · ahead

1.7 mm

dryspate risk

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

Water temperature for brown trout

Warm — slow

22°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 22.1°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.

Hatch timeline · todayQuiet day

Hatch predictions

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read 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

Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year

0–3 scale · July highlighted

Alpine Rhithrogena

Sculpin / Baitfish (Rivers)

March Brown

Large Stonefly

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 · 2

Probably above the brown trout safety line — these are likely cooler, but carry a thermometer.

Gallery · 2

Huesca (provincia), rápidos 1993 01
Terrain map

About this water

The Aragón Subordán flows through the dramatic Hecho valley before joining the main Aragón. Limestone gorge creates clear, alkaline freestone water with strong wild-trout populations. The Oza tributary is a classic high-mountain stream ideal for technical dry-fly work. Good wading required.

Limestone

Water quality (WFD)

Ecology: Good
Chemical: Unknown

WFD classification · ES091MSPF516

The full read · show the working · for brown trout · confidence 90%

How the 12 is built — score × weight = contribution

Temperature6 × 28%1.7

Flow60 × 22%13.2

Clarity95 × 18%17.1

Feeding Time70 × 13%9.1

Pressure80 × 7%5.6

Insect activity53 × 12%6.4

Limiting factor: Water temperature (22.1°C) is outside Brown Trout's preferred range (10–16°C)= 53

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

Apple Maps Google Maps

Seasons & zones

Troutcheck named Aragón coto or free section → check named Aragón coto or free section

Related guides

Booking & contacts

Freestone · Limestone · Aragón

Aragón Subordán

Contributor photo

Huesca (provincia), rápidos 1993 01

LBM1948 (https://commons.wikimedia.org/wiki/User:LBM1948) - CC BY-SA

The Aragón Subordán flows through the dramatic Hecho valley before joining the main Aragón.

Poor · Brown Trout

Klinkhammer · 14-18

Likely too hot — check on arrivalThe water is probably above the brown trout safety line — carry a thermometer.

DepthShaded riffles, deep pools, spring inflows, cold tributary mouths. That is where the fish will be.
TimingDawn and dusk only. Nothing in the middle of the day.

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

Notify when prime

What moved it

LevelDry recentlyNo gauge reading
Water temp22.1°C
ClarityClear

Today’s fly

Klinkhammer14-18

High-confidence seasonal pick

Conditions on the water

Estimate

Level

Dry recently

No gauge reading

Water temp22.1°C

ClarityClear

Weather24°C

WindSE 8 km/h

Pressure1017 hPa

Rain · recent0.0 mm

Rain · ahead1.7 mm

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

Water temperature for brown trout

Warm — slow

22°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 22.1°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.

Hatch timeline · todayQuiet day

Hatch predictions

See the full hour-by-hour hatch timeline with Pro.

Start free trial

14-day free trial. Cancel anytime.

Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

Start free trial

14-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

Alpine Rhithrogena

Sculpin / Baitfish (Rivers)

March Brown

Large Stonefly

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 · 2

Probably above the brown trout safety line — these are likely cooler, but carry a thermometer.

Gave d'Estaubé

29 km

~15°C

Brown trout · Grayling

Gave d'Aspe

35 km

~17°C