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.

Today · Closed season
Duracell Jig Nymph
Forecast · Today
Closed season
Out of season. Try elsewhere.
45% projected
Today's fly
Duracell Jig Nymph
Duracell Jig Nymph
Conditions on the water · Today
Live gauge
Level
Rising
1.11 m
Lifting fast
Water temp7.8°C
ClarityUnfishable
Weather3°C
WindN 18 km/h
Pressure1024 hPa
Rain · recent89.5 mm
Rain · ahead0.0 mm

The nearest gauge doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Marble Trout
Cool — slow
8°C est.ideal 8–13°C
0°14°28°
How to fish it · for Marble 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.
Likely species
Mayflies
Stoneflies
Gammarids
Hatch timeline · todayQuiet day

12pm(now) — Autumn Olive

Stage: On emergersApproach: Emerger or dryActivity: 18%

Low insect activity predicted today

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 4 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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Evidence
Records-basedModerate confidence

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

Through the year
0–3 scale · November 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
Marble 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.

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
0
Marble trout · Marble brown hybrid trout · Brown trout
Koritnica (Bača tributary, Rut)
11 km
0
Marble trout · Brown trout · Grayling
Kneža
11 km
0
Marble trout · Brown trout · Grayling
Idrijca
13 km
0
Brown trout · Marble trout · Grayling
River Bača
14 km
0
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

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 Marble Trout · confidence 65%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow64 × 22%14.1
Clarity40 × 18%7.2
Feeding Time80 × 13%10.4
Pressure80 × 7%5.6
Insect activity54 × 12%6.5
Conditions total= 72
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
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
At a glance

River Trebuščica is a freestone river in Primorska / Tolmin, Slovenia. The catchment geology is recorded as limestone, and the water sits at about 249 m above sea level. The river is described as roughly 15 km long. Species listed for this water: brown trout and marble trout. The trout season is recorded as running from 1 March to 20 October. The marble trout season is recorded as running from 1 April to 20 October. Best window recorded for anglers: May–August. Core methods listed: Upstream nymph; Dry fly. Level and flow data for this water is linked from 1 gauge. Its Water Framework Directive ecological status is recorded as good. Nearby waters in our listings include Cerknica (Idrijca tributary) at 11 km, Koritnica (Bača tributary, Rut) at 11 km and Kneža at 11 km.