Limestone · South / Tipperary

Suir

The weir on the River Suir at Cahir, turbulent water over the stone sill and calm pool below.
Contributor photo

Cahir weir of the River Suir

Stuart Logan - CC BY-SA 2.0

Major southern salmon river flowing through Cahir and Clonmel — a declining Atlantic salmon system where conservation must come first.

Fair · Atlantic Salmon
Ally's Shrimp · 10–14 doubles
Fairlive now
Decent — worth a look
Low and clear — careful approach country. Low water tactics — small singles, riffling hitch in the smooth glides.
75% confidence
What moved it
  • Level0.31 mLast reading 1h ago
  • Water temp16.4°C
  • ClarityClear
Today’s fly
Ally's Shrimp
Ally's Shrimp10–14 doubles
Shrimp-style pattern essential for SW Irish salmon. The Munster Blackwater system in particular responds well to orange shrimp dressings in the spring months; Ally's Shrimp or similar covers the traditional approach.
Conditions on the water
Live gauge
Level
Steady
0.31 m
Last reading 1h ago
Water temp16.4°C
ClarityClear
Weather11°C
WindW 14 km/h
Pressure1026 hPa
Rain · recent1.8 mm
Rain · ahead0.2 mm

Live readings only. Trends shown where the gauge supports them.

Water temperature for atlantic salmon
Warm — slow
16.4°Cideal 1014°C
0°14°28°
How to fish it · for atlantic salmon
When
Spring run from March; grilse from late May; main run summer through autumn. The Suir is a substantial river — fish the dropping water 12 to 24 hours after rain.
Where
Beats from Cahir through Clonmel to Carrick-on-Suir. Heads, tails, and named lies on the assigned beat.
Method
Spring: tube on a sink-tip swung deep through the main pools. Summer and autumn: small doubles on a floater across-and-down. Catch-and-release on most beats.
Kit
12 to 13 ft #8 double-hander on the bigger water; 11 ft switch on smaller beats. Floating line plus fast-sink tip. 10 to 12 lb fluoro tippet.
Why this works
The signs are strong. Water starting to fall after a rise — early stages of coming into shape. Still coloured but fining — improving conditions. 16.4°C — close to ideal for summer salmon. Conditions are moving in the right direction and should be fishable soon if not already.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 8 active hatches hour by hour with Pro.

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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 · July 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
Daddy Long LegsHatch
2
3
2
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
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.
  • Mix of club and private water
  • Cahir and Ardfinnan are key salmon beats
  • State rod licence required
  • Brown trout C&R on many stretches.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 6
  1. The weir on the River Suir at Cahir, turbulent water over the stone sill and calm pool below.
    Cahir weir of the River Suir
  2. The River Suir east of Gashouse Bridge at Clonmel, a wide smooth-flowing reach flanked by wooded banks.
    The River Suir at Clonmel
  3. The River Suir flowing through open countryside near Cahir, green riparian banks and shallow riffles.
    River Suir near Cahir
  4. The River Suir near Holycross, a wide glide with overhanging trees on the far bank.
    River Suir near Holycross
  5. The River Suir at Holycross with the medieval Abbey reflected in the still water and waterfowl on the surface.
    River Suir at Holycross Abbey
  6. Terrain map of the venue
    Terrain map
About this water

Major southern salmon river flowing through Cahir and Clonmel — a declining Atlantic salmon system where conservation must come first. Limestone-enriched water that is productive and clear, supporting excellent wild brown trout in the upper reaches with reliable mayfly and olive hatches. Spring and grilse runs arrive on schedule, with good sea trout in the estuary and lower river; all migratory fish should be released unharmed. Fish the pools systematically with sunk-tip in spring, smaller doubles in summer. A river of significant trout potential alongside modest salmon opportunities.

Under the surface

The Suir rises on the Devil's Bit in Tipperary and runs a hundred and eighty-five kilometres south and then east to Waterford Harbour, where it joins the Barrow and the Nore. For most of its length it flows over Carboniferous limestone — turning to Old Red Sandstone toward Waterford — and that lime-rich water makes it one of the great brown-trout rivers of Europe, producing trout in numbers few rivers can match. It is a wide, strong, even-flowing river of clear water, weed-rich glides and defined pools through fertile farmland. The Suir is also a salmon river — it gave up the Irish rod record, a fish of fifty-seven pounds, in 1874 — though, as on so many Atlantic rivers, the stock has declined, the best of it lying downstream of Ardfinnan. The character is classic limestone water. Wading is steady over firm gravel and weed, the clear flow rewarding a careful approach.

Wading: Weed and clear water over firm gravel

  • Limestone
  • Unconfined
  • Pool riffle
Water quality (WFD)
  • EcologyModerate
  • ChemicalUnknown
What this classification means

EPA WFD 2019-2024 — Moderate ecological status; corrected (was Good) 2026-06-18. Source: EPA Ireland WFD 2019-2024 classification (catchments.ie / EDEN).

EPA (Ireland) · IESE_16S021700

The full read · show the working · for atlantic salmon · confidence 75%
How the river scores — hydrology factors
Water heightLow But Fishable-0.7
Recent riseNone0.0
Falling after liftFalling Slightly After Lift+3.0
Water temperatureWarm-3.5
Time in seasonSummer Peak Window+0.8
ClarityClearing+2.4
Hydrology base2.0
Will they take?Neutralcaps the band

Taking mood is fair — clearing, stained water.

Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
What would change the calculation
No prolonged stable spell before the current rise.
Directions
Seasons & zones
  • Salmon17 March → 30 SeptemberC&R
  • Trout17 March → 30 September
Related guides
Booking & contacts