Freestone · Limestone · Primorska / Trenta & Bovec, SI

Upper Soča (Trenta)

Primelive now

About as good as it gets

River steady at a fishable height. On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.

75% confidence

Notify when prime

What moved it

Level0.78 mLast reading 3h ago
Water temp10.8°C
ClarityClear

Today's fly

Elk Hair Caddis12-16

High-confidence seasonal pick

Rules at a glance

Permit required

Live now

Conditions on the water

Live gauge

Trends shown where the gauge supports them

Level

Steady

0.78 m

Last reading 3h ago

Water temp

10.8°C

coldwarm

Clarity

Clear

Weather

16°C

Rain

Wind

N 4 km/h

calmblown out

Pressure

1013 hPa

lowhigh

Rain · recent

35.7 mm

dryspate risk

Rain · ahead

4.0 mm

dryspate risk

Live readings only. Trends shown where the gauge supports them.

Water temperature for Rainbow Trout

Ideal

10.8°Cideal 10–18°C

0°14°28°

How to fish it · for Rainbow 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

Excellent — water temperature is right today, though time of day could be better.

Likely species

Mayflies

Large dark oliveMost likely
#14–16 · Emerger
Dead-drift the emerger — it's sitting in the film.
Anglers curse mayfliesAlso possibleLower confidence
#20–22 · Spinner
Go tiny: 20-22 spent spinner, single fly, long tippet.

Hatch timeline · todayQuiet day

Hatch predictions

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

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey

Hatch predictions

See what else is on the menu with Pro.

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Evidence

ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

Through the year

0–3 scale · August highlighted

Grayling season

Grannom

Evening Sedge

Alpine Rhithrogena

Large Dark Olive

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

Ranked for today

Rainbow Trout fly box

Permits & access

Permit required — see local rules.

Zavod za ribištvo Slovenije (ZZRS) district, NOT RD Tolmin — a separate permit
Fly only, artificial fly
Day and 3-day permits in catch-and-release and catch-and-take tiers, with or without the Lepena and Koritnica tributaries
Barbless is the norm on marble water and is required on the neighbouring RD Tolmin district — confirm the current ZZRS terms when you buy rather than assuming they match.

What's coming

Plan ahead

5-day outlook

Other water nearby · 5

The full read · show the working · for Rainbow Trout · confidence 75%

How the 80 is built — score × weight = contribution

Temperature100 × 28%28.0

Flow80 × 22%17.6

Clarity85 × 18%15.3

Feeding Time45 × 13%5.9

Pressure75 × 7%5.3

Insect activity64 × 12%7.7

Conditions total= 80

Can you trust it?

Water temperaturelive gauge readinggauge

Level / flowon-river gaugeobserved

Prey activitymodelled from regional profilemodelled

What would change the calculation

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

Directions

Apple Maps Google Maps

Seasons & zones

Rainbow trout 1 April → 31 October
Grayling 16 May → 31 October
Adriatic grayling (lipan). ZZRS sells permits for this district only between 1 April and 31 October, so the national grayling window closes early here in practice. Check the current permit terms.
Prime sport 1 September → 31 October
Marble trout 1 April → 30 September

Related guides

Booking & contacts

Freestone · Limestone · Primorska / Trenta & Bovec, SI

Upper Soča (Trenta)

Terrain map

Prime · Rainbow Trout

Elk Hair Caddis · 12-16

Primelive now

About as good as it gets

River steady at a fishable height. On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.

75% confidence

Notify when prime

What moved it

Level0.78 mLast reading 3h ago
Water temp10.8°C
ClarityClear

Today's fly

Elk Hair Caddis12-16

High-confidence seasonal pick

Conditions on the water

Live gauge

Level

Steady

0.78 m

Last reading 3h ago

Water temp10.8°C

ClarityClear

Weather16°C

WindN 4 km/h

Pressure1013 hPa

Rain · recent35.7 mm

Rain · ahead4.0 mm

Live readings only. Trends shown where the gauge supports them.

Water temperature for Rainbow Trout

Ideal

10.8°Cideal 10–18°C

0°14°28°

How to fish it · for Rainbow 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

Excellent — water temperature is right today, though time of day could be better.

Likely species

Mayflies

Large dark oliveMost likely
#14–16 · Emerger
Dead-drift the emerger — it's sitting in the film.
Anglers curse mayfliesAlso possibleLower confidence
#20–22 · Spinner
Go tiny: 20-22 spent spinner, single fly, long tippet.

Hatch timeline · todayQuiet day

Hatch predictions

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

Start free trial

14-day free trial. Cancel anytime.

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey

Hatch predictions

See what else is on the menu with Pro.

Start free trial

14-day free trial. Cancel anytime.

Evidence

ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

Through the year

0–3 scale · August highlighted

Grayling season

Grannom

Evening Sedge

Alpine Rhithrogena

Large Dark Olive

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

Ranked for today

Rainbow Trout fly box

Permits & access

Permit required — see local rules.

Zavod za ribištvo Slovenije (ZZRS) district, NOT RD Tolmin — a separate permit
Fly only, artificial fly
Day and 3-day permits in catch-and-release and catch-and-take tiers, with or without the Lepena and Koritnica tributaries
Barbless is the norm on marble water and is required on the neighbouring RD Tolmin district — confirm the current ZZRS terms when you buy rather than assuming they match.

What's coming

Plan ahead

5-day outlook

Other water nearby · 5

Učja

9.0 km

Marble trout · Brown trout · Rainbow trout

Soča

11 km

Brown trout · Marble trout

Savica

13 km

Brown trout · Lake trout

Mostnica

17 km

Marble trout · Brown trout

Sava Dolinka

18 km

Brown trout · Rainbow trout

The full read · show the working · for Rainbow Trout · confidence 75%

How the 80 is built — score × weight = contribution

Temperature100 × 28%28.0

Flow80 × 22%17.6

Clarity85 × 18%15.3

Feeding Time45 × 13%5.9

Pressure75 × 7%5.3

Insect activity64 × 12%7.7

Conditions total= 80

Can you trust it?

Water temperaturelive gauge readinggauge

Level / flowon-river gaugeobserved

Prey activitymodelled from regional profilemodelled

What would change the calculation

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

Directions

Apple Maps Google Maps

Seasons & zones

Rainbow trout 1 April → 31 October
Grayling 16 May → 31 October
Adriatic grayling (lipan). ZZRS sells permits for this district only between 1 April and 31 October, so the national grayling window closes early here in practice. Check the current permit terms.
Prime sport 1 September → 31 October
Marble trout 1 April → 30 September

Booking & contacts