Spate · Slate · West Wales / Carmarthenshire, GB-WLS

Towy (Tywi)

The River Towy flowing in broad meanders through the valley below Dinefwr Castle near Llandeilo.

Wales's premier sewin (sea trout) river and major salmon river.

Tomorrow · Closed season
Hare's Ear Nymph
Forecast · Tomorrow
Closed season
Out of season. Try elsewhere.
45% projected
Today's fly
Hare's Ear Nymph
Hare's Ear Nymph
Conditions on the water · Tomorrow
Live gauge
Level
Rising
1.07 m
Lifting fast
Water temp7.0°C
ClarityUnfishable
Weather3°C
WindN 19 km/h
Pressure1014 hPa
Rain · recent4.6 mm
Rain · ahead9.1 mm

The nearest gauge is at Capel Dewi. It doesn't record temperatures, so we've estimated it — defer to the river keeper's advice.

Water temperature for Brown Trout
Cool — slow
7°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the open trout season. Spring olives April through May; sedges through summer; small dark flies into autumn close. Spate-driven — fish 12 to 24 hours after rain.
Where
Pool tails, riffle heads, and the seams behind boulders through the upper and middle Tywi. Welsh freestone — pocket-to-pocket reading.
Method
Upstream dry to risers; dry-dropper through the riffles. North Country spider on the swing in cooler water. Spate-driven on falling water.
Kit
9 ft #4 — Welsh freestone default. Floating line, 9 to 12 ft leader to 4 to 5 lb fluoro. Studded boots — slate slabs run slick.
Likely species
Stoneflies
Gammarids
Hatch timeline · tomorrowPeak at 11am

12pm(now) — Autumn Needle Fly

Stage: Creeping nymphsApproach: Heavy nymphActivity: 35%
Peak emergence window

Peak activity at 11am — Autumn Needle Fly (Autumn Needle Fly, Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds as a supporter.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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Evidence
Survey-backed · regionalHigh confidence

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

Through the year
0–3 scale · November highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
2
2
2
1
Trout seasonSeason
1
2
2
2
2
2
1
March BrownHatch
2
3
2
CapererHatch
2
3
3
2
Heather FlyHatch
2
2
Autumn DunHatch
2
3
2

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

Ranked for today
Brown Trout fly box

Shrimp fly theme — fished swing, wet_fly_swing

Beats · 5 · 3 reaches
Main Towy — association water (Llandovery to Carmarthen)Access varies
The Towy (Tywi) is one of the finest sea trout — sewin — rivers in the British Isles, with a good run of salmon to autumn and brown trout throughout.
Visit official site ↗
Golden Grove & estate beatsAccess varies
Alongside the associations, several private estate beats on the lower and middle Towy — including a cluster around Golden Grove (Cilsane, Dryslwyn Castle, Glanyrafon, Upper and Lower Ro Fawr) — are let to visiting rods through the Fishing Passport.
Visit official site ↗
Towy tributaries · 3 beatsMixed
River Gwili — Carmarthen Amateur AA, River Gwili — Carmarthen & District AC, River Camddwr (Towy headwaters) — Tregaron AA
The 3 beats
River Gwili — Carmarthen Amateur AADay tickets
Carmarthen Amateur Angling Association
Two beats totalling 4.5 miles (Glangwili Bridge to Bronwydd, and Bronwydd Village to Dyffryn Gwili) on this Tywi tributary — sea trout (sewin) is the headline draw, alongside wild brown trout.
Day ticket £30, weekly £135 (2026 pricing).
Visit official site ↗
River Gwili — Carmarthen & District ACMembers
Carmarthen & District Angling Club
Two further Gwili stretches near the Gwili Railway and a Quarry stretch further out toward the A484 — a separate club from Carmarthen Amateur AA, est. 1953.
Members only via Clubmate — no day tickets, no published price.
Visit official site ↗
River Camddwr (Towy headwaters) — Tregaron AADay tickets
Tregaron Angling Association
Seven miles of remote wilderness fishing on a Towy tributary in the Cambrian Mountains near Llyn Brianne reservoir — small but plentiful wild brown trout. Note: there's a second, unrelated river also called Camddwr near Tregaron itself, a Teifi tributary through Cors Caron bog — this is not that river.
Tregaron AA also controls 17 miles of the Teifi itself, Llyn Berwyn and the Teifi Pools.
Visit official site ↗
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Irfon
16 km
0
Brown trout · Grayling · Salmon
Amman
22 km
0
Brown trout · Sea trout · Salmon
Afon Twrch
24 km
0
Brown trout
Wye
28 km
0
Brown trout · Salmon · Grayling
Cothi
19 km
Brown trout · Salmon · Sea trout
Gallery · 6
  1. The River Towy flowing in broad meanders through the valley below Dinefwr Castle near Llandeilo.
    River Towy below Dinefwr Castle
  2. The River Towy running through Llandovery, Carmarthenshire, with the valley beyond.
    River Towy at Llandovery
  3. A wide view of the River Towy flowing through the Llangunnor reach at Carmarthen.
    River Towy at Carmarthen
  4. The River Towy at Llandilo-yr-ynys near Nantgaredig, a wide shallow reach in Carmarthenshire.
    River Towy at Llandilo-yr-ynys, Nantgaredig
  5. The Afon Tywi winding through its flood plain near Llandovery, Carmarthenshire.
    Afon Tywi near Llandovery
  6. Terrain map of the venue
    Terrain map
About this water

Night fishing for sewin from April through summer is legendary — large fish, aggressive takes. Salmon from February onwards. Fish sinking-tip line with medium tubes in spring for salmon; switch to smaller doubles and wet flies for daytime fishing. Sea trout take throughout spring and summer; night fishing (June–August, particularly July) is most productive. Flows through Llandeilo and Carmarthen. Slate and schist bedrock underlie this river. Atlantic salmon are under serious conservation pressure — Natural Resources Wales mandates catch-and-release for salmon on all rivers, so all fish must be returned.

Sea trout here

Summer-autumn runs (June–September), primarily nocturnal

  • Slate
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown
What this classification means

NRW WFD Cycle 3 — Tywi (confluence with Cothi to spring tidal limit): Good ecological status; the association main-stem water (Llandovery–Carmarthen). Corrected 2026-06-18 from a Gwili-tributary tag (Crychiau), not the Towy main stem. Source: NRW DataMapWales WFD Cycle 3 classification layer.

NRW (Wales) · GB110060029290

The full read · show the working · for Brown Trout · confidence 75%
How the 0 is built — score × weight = contribution
Temperature48 × 28%13.4
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity27 × 12%3.2
Conditions total= 64
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Warmer water — toward the 10–16 °C ideal band — would lift the temperature score.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Salmon 1 April → 17 October
  • Trout 3 March → 30 September

Sea trout: Variable seasonal (2026) — NRW monitoring places 32 of 33 Welsh sea trout stocks in the 'At Risk' category. The Towy (Tywi) remains Wales's most productive sewin river and holds genuine runs, but stocks are materially below their 1970s–80s peak. Condition-sensitive: night fishing after rain is productive; low summer water is difficult. Catch-and-release is the conservation default on most beats.

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 Tywi was one of Wales's premier salmon rivers; catches have collapsed.

Related guides
Yorkshire & SpidersNorth Country methodsEuro Nymphingsubsurface methods
Casting instructors near here
Booking & contacts
Boards & regulators
At a glance

Towy (Tywi) is a spate river in West Wales / Carmarthenshire. The catchment geology is recorded as slate, and the water sits at about 50 m above sea level. The river is described as roughly 109 km long. Species listed for this water: brown trout, salmon and sea trout. It is classed as a salmon river. The salmon season is recorded as running from 1 April to 17 October. The trout season is recorded as running from 3 March to 30 September. Best window recorded for anglers: April–June (spring), August–October (autumn). Core methods listed: small double (salmon); upstream nymph; spate techniques. Level and flow data for this water is linked from 3 gauges. Its Water Framework Directive ecological status is recorded as good. Nearby waters in our listings include Irfon at 16 km, Cothi at 19 km and Amman at 22 km.