Stillwater · Peat · Outer Hebrides / Lewis

Loch Roag System

Loch Roag System terrain map
Terrain map

A complex interconnected loch system on Lewis's Atlantic coast, where fresh and salt water mix in a landscape of extraordinary beauty.

Prime · Atlantic Salmon
Primelive now
Prime conditions — go now
Low and clear — careful approach country. Cover the water properly, fish each lie once.
85% confidence
What moved it
  • LevelLight rain recentlyNo gauge reading
  • Water temp13.5°C
  • ClarityClear
Conditions on the water
Estimate
Level
Light rain recently
No gauge reading
Water temp13.5°C
ClarityClear
Weather15°C
WindNE 11 km/h
Pressure1019 hPa
Rain · recent6.7 mm
Rain · ahead14.6 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for atlantic salmon
Ideal
14°C est.ideal 10–14°C
0°14°28°
How to fish it · for atlantic salmon
When
All day — lough fishing is best in a good wave. Early morning and evening can produce in calm conditions.
Where
Work the drift lanes from the upwind shore across the productive zones. Cover bay edges, underwater reefs, and any areas where the bottom shoals.
Method
Fish a sensible line-and-fly combination for the height and pace of water.
Kit
10 ft #7/8 single-hander, floating line, 10–12 lb fluoro leader. Boat seat and waterproofs for the drift.
Why this works
Excellent — water temperature is right today, though river flow could be better.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 7 active hatches hour by hour 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 · July 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
2
1
Daddy Long LegsHatch
2
3
2
Murrough (Great Red Sedge)Hatch
2
3
2
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Lake OliveHatch
1
2
2
2
2
2
1

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

Permits & access
Permit required — see local rules.
  • Multiple estates and clubs control different sections
  • FishHebrides is the best starting point for booking
  • Tide tables essential for sea pool timing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 3
Grimersta River & Loch System
5.0 km
72
Brown trout · Salmon · Sea trout
Loch Morsgail
14 km
Brown trout · Salmon · Sea trout
Loch Langavat (Lewis)
20 km
Brown trout · Char · Salmon
About this water

A complex interconnected loch system on Lewis's Atlantic coast, where fresh and salt water mix in a landscape of extraordinary beauty. The system includes several linked lochs feeding into the sea loch of Roag. Salmon and sea trout enter the system from spring onwards and push through into the freshwater lochs. Brown trout are resident throughout. The mix of brackish and freshwater venues means the fishing character changes markedly between different parts of the system. Sea pools at the tidal interface fish best around low water when fish concentrate. A unique hybrid fishery that demands an understanding of tides and weather. Peat-stained moorland water defines this river. Atlantic salmon stocks are Category 3 (declining) — all salmon must be released.

  • Loch
  • Peat
Why this score · for atlantic salmon
  • Temperature10030% weight
  • Flow6025% weight
  • Clarity9520% weight
  • Feeding Time9015% weight
  • Pressure8510% weight
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Salmon11 February → 31 October
  • Trout15 March → 6 October

Sea trout: Variable seasonal (2026) — Outer Hebrides sea trout system. Sea-lice pressure from Hebridean salmon farms has affected stocks across the entire west coast. 2025 Scottish sea trout rod catches at record lows. Condition-led; local knowledge essential.

Related guides
Scotland Playbookloch & river fishingThermal Layers & Troutreading depth and temperatureAtlantic Salmonsalmon tactics
Booking & contacts