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.

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
2.63 m
Lifting fast
Water temp8.0°C
ClarityVery coloured
Weather1°C
WindN 21 km/h
Pressure1024 hPa
Rain · recent69.9 mm
Rain · ahead2.4 mm

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

Water temperature for Brown Trout
Cool — slow
8°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.
Likely species
Stoneflies
Gammarids
Hatch timeline · todayPeak at 12pm

12pm(now) — Autumn Olive

Stage: On emergersApproach: Emerger or dryActivity: 23%

Peak activity at 12pm — Autumn Olive

Sub-surface · on the nymphunder the surface

Hatch predictions

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

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14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 2 as a supporter.

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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 · November 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
0
Brown trout
Ljubljanica
16 km
0
Hucho · Grayling · Brown trout
Bistra
16 km
0
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

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 55%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow60 × 22%13.2
Clarity15 × 18%2.7
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity45 × 12%5.4
Limiting factor: Water is very coloured — too coloured for Brown Trout= 62
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 March → 30 September
Related guides
Fly Fishing in Slovenia: A Year-Round Guidefeatured in this guideAlpine Streamsmountain entomologyMarble TroutSoča system
Booking & contacts
At a glance

Unica is a limestone river in Inner Carniola / Planina, Slovenia. Its recorded elevation is about 552 m above sea level and the catchment geology is limestone. The river is described as roughly 22 km long. The species listed for this water is brown trout. The trout season is recorded as running from 1 March to 30 September. Best window recorded for anglers: May–August. Core methods listed: Dry fly; Upstream nymph. 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 Cerkniščica at 9.0 km, Ljubljanica at 16 km and Bistra at 16 km.