Freestone · Granite · Castilla y León / Ávila (upper Tiétar headwaters)

Río Tiétar

The Tiétar is a western Gredos granite freestone draining toward the Tagus.

Río Tiétar desde AV-920

Totemkin (https://commons.wikimedia.org/wiki/User:Totemkin) - 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

Level0.32 mLast reading 1h ago
Water temp22.0°C
ClarityClear

Today’s fly

Klinkhammer14-18

Proven pattern for this period

Live now

Conditions on the water

Live gauge

Trends shown where the gauge supports them

Level

Steady

0.32 m

Last reading 1h ago

Water temp

22.0°C

coldwarm

Clarity

Clear

Weather

22°C

Clear

Wind

NW 7 km/h

calmblown out

Pressure

1017 hPa

lowhigh

Rain · recent

0.0 mm

dryspate risk

Rain · ahead

0.0 mm

dryspate risk

Live readings — water temperature is an estimate where the gauge does not record it.

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°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

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

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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

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 fishing licence required on the Ávila side
Check the exact upper Tiétar tramo in the official visor, especially because downstream administration and rules differ once the river leaves the province.

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.

Río Corneja system (research priority)39 km
Brown trout
~17°C

Gallery · 2

Río Tiétar desde AV-920
Terrain map

About this water

The Tiétar is a western Gredos granite freestone draining toward the Tagus. This covers the upper Ávila / Gredos stretch, not the river's full course further downstream. Cold, clear mountain water, pocket water, and pool-and-run structure support wild browns of real Iberian genetic importance, connected to the wider Gredos conservation story.

Granite

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

How the 12 is built — score × weight = contribution

Temperature6 × 28%1.7

Flow80 × 22%17.6

Clarity95 × 18%17.1

Feeding Time45 × 13%5.9

Pressure80 × 7%5.6

Insect activity49 × 12%5.9

Limiting factor: Water temperature (22°C) is outside Brown Trout's preferred range (10–16°C)= 54

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.

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

Directions

Apple Maps Google Maps

Seasons & zones

Trout21 March → 31 July

Related guides

Booking & contacts

Freestone · Granite · Castilla y León / Ávila (upper Tiétar headwaters)

Río Tiétar

Contributor photo

Río Tiétar desde AV-920

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

The Tiétar is a western Gredos granite freestone draining toward the Tagus.

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

Level0.32 mLast reading 1h ago
Water temp22.0°C
ClarityClear

Today’s fly

Klinkhammer14-18

Proven pattern for this period

Conditions on the water

Live gauge

Level

Steady

0.32 m

Last reading 1h ago

Water temp22.0°C

ClarityClear

Weather22°C

WindNW 7 km/h

Pressure1017 hPa

Rain · recent0.0 mm

Rain · ahead0.0 mm

Live readings — water temperature is an estimate where the gauge does not record it.

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°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

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

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 fishing licence required on the Ávila side
Check the exact upper Tiétar tramo in the official visor, especially because downstream administration and rules differ once the river leaves the province.

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.

Río Corneja system (research priority)

39 km

~17°C

Brown trout

Gallery · 2

Río Tiétar desde AV-920
Terrain map

About this water

Granite

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

How the 12 is built — score × weight = contribution

Temperature6 × 28%1.7

Flow80 × 22%17.6

Clarity95 × 18%17.1

Feeding Time45 × 13%5.9

Pressure80 × 7%5.6

Insect activity49 × 12%5.9

Limiting factor: Water temperature (22°C) is outside Brown Trout's preferred range (10–16°C)= 54

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.

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

Directions

Apple Maps Google Maps

Seasons & zones

Trout21 March → 31 July

Booking & contacts