Freestone · Mixed · Slovakia / Horehronie (Low Tatras / Slovak Ore Mountains)

Hron (upper reaches)

The upper Hron river flowing past Brezno in central Slovakia on an overcast day

The upper Hron matters as both a fishery and a conservation story, rising in the Low Tatras and flowing through Horehronie around Brezno.

Poor · Brown Trout
Perdigón · 14-18
Poorlive now
Not the day for it
River temperature is the limiting factor today, not the flow. This is not the day to push it. Check the thermal advice above before you head out.
90% confidence
What moved it
  • Level0.80 m
  • Water temp22.8°C
  • ClarityClear
Today's fly
Perdigón
Perdigón14-18
Euro-nymph
Conditions on the water
Live gauge
Level
Steady
0.80 m
Water temp22.8°C
ClarityClear
Weather29°C
WindSW 11 km/h
Pressure1022 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

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

Water temperature for Brown Trout
Warm — slow
23°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.
Why this works
Water at 22.8°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 2 active hatches hour by hour with Pro.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

Start free trial

14-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
1
Grayling seasonSeason
1
2
2
2
2
2
1
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
1

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

Ranked for today
Brown Trout fly box

Broad mountain-river trout and grayling pack with brown trout at the centre, but room for rainbow and brook trout where present.

Permits & access
Permit required — see local rules.
  • State fishing licence/card (rybársky lístok) plus a local or SRZ-area permit for the specific waters
  • Guest access is possible through local associations and SRZ-linked structures, but exact permit format and duration should be checked water by water.
What's coming
Plan ahead
5-day outlook
Water here around 23°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. The upper Hron river flowing past Brezno in central Slovakia on an overcast day
    The Hron River near Brezno
  2. Terrain map of the venue
    Terrain map
About this water

The upper Hron matters as both a fishery and a conservation story, rising in the Low Tatras and flowing through Horehronie around Brezno. It is one of the rivers where the Living Rivers restoration project focuses on ecological improvement. Brown trout and grayling in mountain and submontane water. Mixed geology from crystalline Low Tatras to the metalliferous Slovak Ore Mountains. Technical nymphing and dry-fly fishing.

  • Mixed
The full read · show the working · for Brown Trout · confidence 90%
How the 4 is built — score × weight = contribution
Temperature2 × 28%0.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time65 × 13%8.5
Pressure80 × 7%5.6
Insect activity55 × 12%6.6
Limiting factor: Water temperature (22.8°C) is outside Brown Trout's preferred range (10–16°C)= 56
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–16 °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 16 April → 30 September
  • Grayling 1 June → 31 December
Related guides
Grayling Playbookgrayling tacticsEuro Nymphingsubsurface methods
Booking & contacts