Freestone · Granite · Castilla y León / Ávila (Sierra de Gredos)

Río Corneja system (research priority)

A Tormes tributary in the Corneja valley noted for outstanding trout genetics.

Agustin Lorenzo

Warm — handle with careBrown Trout are stressed by warm water — handle every fish carefully.

Water estimated at about 18°C from the nearby Río Tormes (upper — Sierra de Gredos) gauge — there's no sensor on this water, so treat it as a guide. Above 18°C, the risk of killing a released fish climbs. Fish dawn or dusk only — the water can be two or three degrees cooler at first light. Barbless hooks. Land it fast — under thirty seconds. Wet hands. No air shots. If a fish swims off slowly or rolls, stop fishing for the day.

DepthShaded riffles, deep pools, spring inflows, cold tributary mouths. Work them and move on.
TimingDawn and dusk only. Avoid the middle of the day — the water peaks then and the fish are most stressed.

Marginallive now

Slow going — pick your moments

Low and clear — careful approach country. Cover and shadow are doing the work today.

80% confidence

Notify when prime

What moved it

LevelProxyvia Río Tormes (upper — Sierra de Gredos)
Water temp18.3°C
ClarityClear

Today’s fly

Klinkhammer14-18

Proven pattern for this period

Live now

Conditions on the water

Proxy gauge

Trends shown where the gauge supports them

Level

Falling

Proxy

via Río Tormes (upper — Sierra de Gredos)

Water temp

18.3°C

coldwarm

Clarity

Clear

Weather

19°C

Clear

Wind

S 4 km/h

calmblown out

Pressure

1022 hPa

lowhigh

Rain · recent

0.0 mm

dryspate risk

Rain · ahead

0.0 mm

dryspate risk

No gauge on this water — conditions are inferred from Río Tormes (upper — Sierra de Gredos). The trend transfers, the absolute level does not.

Water temperature for brown trout

Warm — slow

18°C est.ideal 10–16°C

0°14°28°

How to fish it · for brown trout

When

Through the Castilla y León trout season. The Corneja is small intimate Sierra de Gredos water — fishes well once snowmelt drops.

Where

Pool tails and pocket water through the Corneja system. Small-river scale; read each lie carefully.

Method

Short upstream dry-dropper; nymph the deeper pockets. The Corneja is research-priority water — careful approach, light tackle, fish each lie before moving.

Kit

8'6 ft #3 to 9 ft #4 — small mountain stream. Floating line, 9 to 12 ft leader to 4 lb fluoro. Studded boots.

Why this works

⚠️ Water at 18.3°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.

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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

Trout season

Large Dark Olive

Blue Winged Olive

Autumn Olive

Grannom

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.

Castilla y León licence required
Exact tramos and coto status need confirming from pescacastillayleon.es — this is a research-priority entry
Sin muerte likely on free-access sections.

What's coming

Plan ahead

5-day outlook

Cooler water nearby · 2

Water here around 18°C — probably warm enough to stress brown trout. These are likely cooler.

Gallery · 1

Terrain map

About this water

A Tormes tributary in the Corneja valley noted for outstanding trout genetics. This stream has a strong wild-trout reputation but exact tramos and cotos require official confirmation from pescacastillayleon.es before complete mapping. Likely character: clear mountain tributary with smaller pools and runs suited to dry fly and nymphing on lighter tackle. Clear mountain water in a scenic valley.

Granite

The full read · show the working · for brown trout · confidence 80%

How the 38 is built — score × weight = contribution

Temperature51 × 28%14.3

Flow95 × 22%20.9

Clarity95 × 18%17.1

Feeding Time40 × 13%5.2

Pressure80 × 7%5.6

Insect activity62 × 12%7.4

Conditions total= 71

Can you trust it?

Water temperatureair-to-water estimateestimated

Level / flowproxy via Río Tormes (upper — Sierra de Gredos)proxy

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.

The dawn and dusk windows score higher than the midday lull.

Directions

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Seasons & zones

Trout21 March → 31 July

Related guides

Booking & contacts