Freestone · Limestone · Primorska / Tolmin, SI

River Trebuščica

A clear stream cascading over limestone slabs beneath a stone arch bridge in the Srna gorge, Gorenja Trebuša.

The lower Trebuščica is a small limestone tributary running into the Soča, and one of the quiet places in RD Tolmin's water — the kind of stream you fish because you want to, not because someone told you it was good.

Prime · Brown Trout
Streamer / Woolly Bugger · 6-10
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
What moved it
  • Level0.52 mLast reading 15h ago
  • Water temp11.9°C
  • ClarityClear
Today's fly
SW
Streamer / Woolly Bugger6-10
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.52 m
Last reading 15h ago
Water temp11.9°C
ClarityClear
Weather12°C
WindE 13 km/h
Pressure1026 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

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

Water temperature for Brown Trout
Ideal
11.9°Cideal 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
Excellent — water temperature is working for you, but time of day is the limiting factor today.
Likely species
Mayflies
Stoneflies
Caddisflies
Damselflies & dragonflies
Gammarids
Hatch timeline · todayPeak at 2pm

Hatch predictions

Today's headline hatch shown — see all 12 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 2 as a supporter.

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Evidence
Records-basedModerate confidence

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

Through the year
0–3 scale · September highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
2
1
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1

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

Ranked for today
Brown Trout fly box

Ultra-clear spring-fed rivers with large educated trout. Sight fishing, technical presentation, fine tippets. Euro-nymphing dominant subsurface method. Exceptional dry-fly windows during hatch periods. Gacka is the flagship water.

SW
Streamer / Woolly BuggerTop
6-10 · Pattern
High-confidence seasonal pick
Permits & access
Permit required — see local rules.
  • Fishing licence + permit.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Cerknica (Idrijca tributary)
11 km
Marble trout · Marble brown hybrid trout · Brown trout
Koritnica (Bača tributary, Rut)
11 km
86
Marble trout · Brown trout · Grayling
Kneža
11 km
86
Marble trout · Brown trout · Grayling
Idrijca
13 km
Brown trout · Marble trout · Grayling
River Bača
14 km
Brown trout · Marble trout · Rainbow trout
Gallery · 2
  1. A clear stream cascading over limestone slabs beneath a stone arch bridge in the Srna gorge, Gorenja Trebuša.
    Srna gorge stream, Trebuščica valley
  2. Terrain map of the venue
    Terrain map
About this water

The lower Trebuščica is a small limestone tributary running into the Soča, and one of the quiet places in RD Tolmin's water — the kind of stream you fish because you want to, not because someone told you it was good. It carries genuine marble trout, which is the whole point: the upper 5.7 km above the fishable water is a breeding reserve, permanently closed, and that closure is the reason the fish below it are worth catching at all. Season runs 1 March to 20 October — earlier than most of the district, so don't assume the October dates that apply on the Soča apply here too. Barbless, C&R, and quiet feet.

  • River
  • Limestone
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown
The full read · show the working · for Brown Trout · confidence 75%
How the 80 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity53 × 12%6.4
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 MapsGoogle Maps
Seasons & zones
  • Trout 1 March → 20 October
  • Marble trout 1 April → 20 October
Related guides
Alpine Streamsmountain entomologyMarble TroutSoča systemEuro Nymphingsubsurface methods
Booking & contacts
Clubs & associations
  • RD Tolmin
    Permit required