Limestone · Inner Carniola / Planina, SI

Unica

The Unica's eastern distributary flowing across the flat Planina karst plain, reed-fringed banks under open sky.

The Unica does something most rivers don't bother with: it disappears.

Prime · Brown Trout
Streamer / Woolly Bugger · 6-10
Primelive now
About as good as it gets
Low and clear — careful approach country. Take your time — read the water before you cast.
90% confidence
What moved it
  • Level0.30 m
  • Water temp9.3°C
  • ClarityClear
Today's fly
SW
Streamer / Woolly Bugger6-10
High-confidence seasonal pick
Conditions on the water
Live gauge
Level
Steady
0.30 m
Water temp9.3°C
ClarityClear
Weather20°C
WindNE 11 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
Cool — slow
9.3°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 clarity is right today, though time of day could be better.
Likely species
Mayflies
Stoneflies
Caddisflies
Damselflies & dragonflies
Gammarids
Hatch timeline · todayPeak at 12pm

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 2 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 5 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
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 from ribiške družine.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Cerkniščica
9.0 km
Brown trout
Ljubljanica
16 km
Hucho · Grayling · Brown trout
Bistra
16 km
Brown trout · Grayling · Rainbow trout
Ljubija
16 km
Brown trout · Grayling · Rainbow trout
River Reka
23 km
Brown trout
Gallery · 6
  1. The Unica's eastern distributary flowing across the flat Planina karst plain, reed-fringed banks under open sky.
    Unica on the Planinsko polje
  2. The Unica meandering across the Planina karst plain with grassy banks and karst hills in the distance.
    Unica on the Planina plain
  3. The Unica at the northern edge of the Planina Plain, approaching the ponor sinks.
    Unica at the northern edge of the polje
  4. The Unica emerging from the mouth of Planinska jama into daylight, clear turquoise karst water.
    Unica emerging from Planinska jama
  5. The Unica flowing past the village of Jakovica, Municipality of Logatec, with meadows on the bank.
    Unica at Jakovica
  6. Terrain map of the venue
    Terrain map
About this water

The Unica does something most rivers don't bother with: it disappears. Karst water out of the Planina cave system, spring-fed and limestone-clear, and it goes underground and comes back up again somewhere else entirely — geological theatre that happens to also hold wild brown trout. The hatches on a warm evening can be genuinely exceptional, which feels almost unfair given everything else the river's already got going for it. Fish it for the trout and stay for the fact that you're standing on a river that periodically isn't there.

  • River
  • Limestone
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown
What this classification means

WFD ecological status High → Good corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody SI145VT (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · SI145VT

The full read · show the working · for Brown Trout · confidence 90%
How the 80 is built — score × weight = contribution
Temperature87 × 28%24.4
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity66 × 12%7.9
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 → 30 September
Related guides
Alpine Streamsmountain entomologyMarble TroutSoča systemEuro Nymphingsubsurface methods
Booking & contacts