Freestone · Sandstone · South East Wales / Powys-Monmouthshire

Usk

Usk terrain map
Terrain map

The Usk flows through Brecon and Abergavenny as one of the finest salmon rivers in Wales — it is a river that has seen serious fishing for centuries, and it still rewards the serious angler.

Species

A side-water session, not the main event

River dropping into shape after a lift. Worth a few hours before it drops away.

75% confidence in this read
Water temperature for brown trout
Cool — slow
7°C est.ideal 10–16°C
0°14°28°
Why this score · for brown trout
  • Temperature4828% weight
  • Flow8022% weight
  • Clarity4018% weight
  • Feeding Time5013% weight
  • Pressure807% weight
  • Prey Activity2712% weight
Conditions
Level
0.27 m
Water temp
6.9°C
Estimated
Clarity
Coloured
Clearing
Air temp
8°C
Wind
W 13 km/h
Gentle breeze
Pressure
1008 hPa
Rain · 48h
0.0 mm
No meaningful rain
Rain · ahead
17.6 mm
Moderate rain · next 48h

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

How to fish it · for brown trout
When
March Brown hatch in late March and April is the season's gift — afternoons in cool weather. Mayfly mid-May. Sedges and BWO through summer evenings. Trout season 3 March to 30 September.
Where
Brecon to Abergavenny is the heart of the trout water. Limestone enrichment gives the Usk hatches like nowhere else in Wales — pool-riffle on cobble, the gravel runs and tail-outs holding fish.
Method
Dry to risers when the March Browns are off — afternoons can be electric. Spider team or Czech nymph through riffles between hatches. The Usk responds honestly to good approach work; sloppy presentation is rejected.
Kit
9 ft #5 — limestone-enriched freestone. Floating line, 9 ft tapered leader to 4 to 5 lb fluoro. Studded boots — Welsh river cobble.
Why this works
Fair conditions. Flow is favourable (80), Prey activity is weakest (27).
Through the year
0–3 scale · May highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
2
2
1
1
2
2
2
2
2
2
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.

Directions
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About this water

The Usk flows through Brecon and Abergavenny as one of the finest salmon rivers in Wales — it is a river that has seen serious fishing for centuries, and it still rewards the serious angler. The water is clear when it clears (which is not always), and when the spring salmon are in, they come in serious numbers. It is also a river of trout, of mayfly hatches, and of grayling through winter, which makes it one of the few salmon rivers that will keep you occupied when the salmon aren't taking. Spring salmon (February–April) are the main draw; fish them on sinking-tip line with medium-sized flies (tube flies #1 inch, or doubles #6–8) worked across and downstream. Summer grilse and autumn fish run through the year; late autumn (October–November) brings good salmon opportunity. Sea trout (sewin) run from May onwards; they are daytime fish on the Usk (unlike the night feeders of northern English rivers) and take flies throughout the day. The Usk has a strong mayfly hatch (duffers fortnight, mid-May) which brings excellent dry-fly opportunity for wild browns; summer sedge fishing is reliable (June–July, particularly in evening). Winter grayling fishing (October–March) on small duns and spider patterns. Access via beats (syndicate and estate control); check local availability.

  • Sandstone
Seasons & zones
  • Salmon1 February → 17 October
  • Trout3 March → 30 September
  • Grayling16 June → 14 March

Sea trout: Variable seasonal (2026) — NRW At Risk classification. Usk sea trout (sewin) are present and fish can be taken on the daytime from June, but stocks are below historical levels. The Usk is primarily known as a salmon and brown-trout river; sea trout are a secondary quarry.

Salmon: Negligible (2026) — NRW / EA 2024 Salmon Stocks Assessment classifies this Welsh principal salmon river 'at risk' — egg deposition below Conservation Limit. All Wales byelaws (in force 2020-2030) make catch & release mandatory. Conservation priority; not a salmon fishing destination. The Usk has seen catastrophic salmon decline; agricultural pollution and warming a major factor.

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