Soča tributary with marble trout and rainbow trout, a limestone gorge river with clear water and fly-only regulations. The secondary rivers of any system often reward exploration.
- River
- Limestone
Water temperature for rainbow trout
Ideal16.9°Cideal 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
Good — water temperature is working for you, but time of day is the limiting factor today.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 12 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
ModelledModerate confidence
Modelled from regional ecology — no survey or occurrence data for this water yet.
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
Permits & access
Permit required — see local rules.
- Fishing licence + permit.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 4
Confluence of the Bača and Idrijca 
The Bača near Bača pri Modreju 
The Bača at Klavže Terrain map
About this water
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · SI628VT
The full read · show the working · for rainbow trout · confidence 75%
How the 79 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time40 × 13%5.2
Pressure75 × 7%5.3
Insect activity62 × 12%7.4
Conditions total= 79
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
Seasons & zones
- Trout1 March → 30 September
- Marble trout1 April → 31 October
Related guides
Booking & contacts
River Bača
Contributor photo
Confluence of the Bača and Idrijca
Savinjc - CC BY-SA 4.0
Soča tributary with marble trout and rainbow trout, a limestone gorge river with clear water and fly-only regulations.
Water temperature for rainbow trout
Ideal16.9°Cideal 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
Good — water temperature is working for you, but time of day is the limiting factor today.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 12 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
ModelledModerate confidence
Modelled from regional ecology — no survey or occurrence data for this water yet.
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
Permits & access
Permit required — see local rules.
- Fishing licence + permit.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 4
Confluence of the Bača and Idrijca The Bača near Bača pri Modreju The Bača at Klavže Terrain map
About this water
Soča tributary with marble trout and rainbow trout, a limestone gorge river with clear water and fly-only regulations. The secondary rivers of any system often reward exploration.
- River
- Limestone
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · SI628VT
The full read · show the working · for rainbow trout · confidence 75%
How the 79 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time40 × 13%5.2
Pressure75 × 7%5.3
Insect activity62 × 12%7.4
Conditions total= 79
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
Seasons & zones
- Trout1 March → 30 September
- Marble trout1 April → 31 October
Related guides
Booking & contacts