Lowland · Mixed · East Jutland

Gudenå

The Gudenå river winding through a grassy meadow near Resenbro, Denmark, lined with bare trees

Denmark's longest river at 160 kilometres, winding from the lake district near Tørring through Silkeborg to Randers Fjord.

Poor · Atlantic Salmon
Teal Blue & Silver · size 8 12
Poorlive now
Slow going — better windows ahead
River steady at a fishable height. Little in your favour today. Fish the certain lies, or leave it for a better one.
90% confidence
What moved it
  • LevelProxyvia Karup Å
  • Water temp22.3°C
  • ClarityClear
Today's fly
Teal Blue & Silver
Teal Blue & Silversize 8 12
Regional salmon default — river-specific evidence is thin.
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Karup Å
Water temp22.3°C
ClarityClear
Weather24°C
WindS 6 km/h
Pressure1013 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

No gauge on this water — conditions are inferred from Karup Å. The trend transfers, the absolute level does not.

Water temperature for Atlantic Salmon
Welfare risk
22°C est.ideal 10–14°C
0°14°28°
How to fish it · for Atlantic Salmon
When
Morning into early afternoon.
Where
Pool tails, steadier runs, and any water with pace.
Method
Fish a sensible line-and-fly combination for the height and pace of water.
Kit
13 ft #8/9 double-hander in spate, 10 ft #8 single in low water. Floating line plus a fast-sink tip. 12–15 lb fluoro tippet.
Why this works
Water at 22.3°C. This is the line where catch-and-release kills atlantic salmon. Do not fish for them today.
Hatch timeline · todayPeak at 6pm

Hatch predictions

Today's headline hatch shown — see all 10 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 3 with Pro.

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Evidence
Survey-backed · regionalModerate confidence

Backed by regional invertebrate surveys; no sampling on this exact reach yet.

Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
1
Sea trout runRun
1
2
2
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
2
2
2
1
Terrestrial BeetlesHatch
2
3
3
2
Blue Winged OliveHatch
1
2
2
2
2
1
Black MidgeHatch
1
2
2
2
2
2
2
2
2
2
2
1
Summer River MidgeHatch
1
2
2
2
1

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

Ranked for today
Atlantic Salmon fly box
Permits & access
Permit required — see local rules.
  • Fisketegn + local permit
  • Some free public access areas
  • Sea trout currently protected in parts of the system upstream of Lilleåen — check current rules carefully.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Probably above the Atlantic Salmon safety line — these are likely cooler, but carry a thermometer.
Lilleåen
34 km
~21°C
Brown trout · Sea trout
Gallery · 2
  1. The Gudenå river winding through a grassy meadow near Resenbro, Denmark, lined with bare trees
    The Gudenå near Resenbro
  2. Terrain map of the venue
    Terrain map
About this water

Denmark's longest river at 160 kilometres, winding from the lake district near Tørring through Silkeborg to Randers Fjord. Riverfisher recorded 333 salmon in 2025 and is built around salmon in the Gudenå system, but the story is spatially specific: salmon and sea-trout fishing takes place in the lower river below Tangeværket, and sea trout are currently protected in part of the system upstream of Lilleåen. Riverfisher points anglers toward the Lilleåen tributary for really big sea trout. The upper reaches and tributaries hold wild brown trout, and coarse fish are present throughout. Day tickets from local associations. Atlantic salmon are managed under strict national quotas (DTU Aqua) — each river runs a limited annual kill quota and switches to catch-and-release once it is filled; check the quota before fishing.

  • Mixed
The full read · show the working · for Atlantic Salmon · confidence 90%
How the river scores — hydrology factors
Water heightMedium Ideal0.0
Recent riseNone0.0
Falling after liftNot Applicable0.0
Water temperatureCool To Moderate0.0
Time in seasonOpening Period0.0
ClarityClearing0.0
Hydrology base0.0
Legal gate: Unknown Check Local Rules
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Karup Åproxy
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Salmon 1 April → 31 October
  • Sea trout 1 March → 30 November
  • Trout 1 March → 30 November

Sea trout: Variable seasonal (2026)

Related guides
Atlantic Salmonsalmon tacticsEuro Nymphingsubsurface methods
Booking & contacts