Freestone · Limestone · Primorska / Goriška Brda (Italian border)

Idrija (Judrio)

Idrija (Judrio) — Fiume Judrio, alto corso

Not to be confused with the Idrijca — this is the Idrija, known on the Italian side of the border as the Judrio, a border river through the Goriška Brda wine country managed by RD Soča.

Poor · Rainbow Trout
Elk Hair Caddis · 12-16
Poorlive now
Not the day for it
Low and clear — careful approach country. A morning for the obvious fish only.
90% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp22.4°C
  • ClarityClear
Today's fly
Elk Hair Caddis
Elk Hair Caddis12-16
High-confidence seasonal pick
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp22.4°C
ClarityClear
Weather27°C
WindNE 6 km/h
Pressure1014 hPa
Rain · recent0.0 mm
Rain · ahead0.2 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for Rainbow Trout
Warm — slow
22°C est.ideal 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
Water at 22.4°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 8 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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

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

Ranked for today
Rainbow 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.
  • Fly-only, barbless.
What's coming
Plan ahead
5-day outlook
Water here around 22°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Idrija (Judrio) — Fiume Judrio, alto corso
    Fiume Judrio, alto corso
  2. Terrain map of the venue
    Terrain map
About this water

Not to be confused with the Idrijca — this is the Idrija, known on the Italian side of the border as the Judrio, a border river through the Goriška Brda wine country managed by RD Soča. Genuinely a separate water from its better-known near-namesake, with marble and hybrid trout, brown trout, rainbow, and Italian chub drifting across from the downstream Italian reach. Store it with confluence coordinates, not just the name — this is exactly the kind of naming collision that causes real bugs.

  • River
  • Limestone
The full read · show the working · for Rainbow Trout · confidence 90%
How the 14 is built — score × weight = contribution
Temperature7 × 28%2.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time60 × 13%7.8
Pressure75 × 7%5.3
Insect activity57 × 12%6.8
Limiting factor: Water temperature (22.4°C) is outside Rainbow Trout's preferred range (10–18°C)= 55
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
What would change the calculation
Cooler water — back toward the 10–18 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 March → 30 September
  • Marble trout 1 April → 31 October
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