Karst Spring · Limestone · Karlovac County / Risnjak NP

Kupa (Risnjak National Park)

Risnjak National Park venue image
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The Kupa rises as a powerful karst spring at the foot of Risnjak mountain near Razloge — one of the classic Dinaric karst spring rivers.

Species

A proper day on the water

Low and clear — careful approach country. Stay small, stay accurate.

55% confidence in this read
Water temperature for grayling
Ideal
6°C est.ideal 4–14°C
0°14°28°
Why this score · for grayling
  • Temperature10028% weight
  • Flow8022% weight
  • Clarity8518% weight
  • Feeding Time1013% weight
  • Pressure807% weight
  • Prey Activity2712% weight
Conditions
Level
Light rain recently
No gauge reading
Water temp
5.7°C
Estimated
Clarity
Clear
Air temp
1°C
Wind
N 12 km/h
Light breeze
Pressure
1011 hPa
Rain · 48h
4.0 mm
Light rain
Rain · ahead
1.4 mm
No meaningful rain · next 48h

Live readings — water temperature is an estimate where the gauge does not record it.

How to fish it · for grayling
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
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Why this works
Good conditions. Temperature is favourable (100), Feeding time is weakest (10).
Through the year
0–3 scale · May highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Large Dark OliveHatch
1
2
2
1
March BrownHatch
1
2
1
Iron BlueHatch
1
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1

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

Gallery · 1
  1. Terrain map of the venue
    Terrain map
Permits & access
Permit required — see local rules.
  • Croatian freshwater fishing licence required
  • Risnjak NP permit required for the source area
  • Check Croatian Angling Federation for beat permits.
Directions
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About this water

The Kupa rises as a powerful karst spring at the foot of Risnjak mountain near Razloge — one of the classic Dinaric karst spring rivers. Cold, blue-green, emerald-clear limestone water with wild brown trout, grayling, and hucho in the deeper holding pools. The source reach in Risnjak NP is among the finest wild-trout water in Croatia.

  • Limestone
Other water nearby · 5
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