Freestone · Volcanic · Vesturland

Grímsa

Tröllafossar rapids on the Grímsá, turbulent white water in a rocky channel.
Prime · Atlantic Salmon
Green Butt · 12-16 doubles
Primelive now
Prime conditions — go now
Low and clear — careful approach country. Cover the water properly, fish each lie once.
70% confidence
What moved it
  • LevelLight rain recentlyNo gauge reading
  • Water temp10.0°C
  • ClarityClear
Today's fly
Green Butt
Green Butt12-16 doubles
Small pools suit small flies. First-choice on the Grímsa.
Conditions on the water
Estimate
Level
Light rain recently
No gauge reading
Water temp10.0°C
ClarityClear
Weather8°C
WindNW 14 km/h
Pressure1008 hPa
Rain · recent7.8 mm
Rain · ahead0.0 mm

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

Water temperature for Atlantic Salmon
Ideal
10°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
Excellent — water temperature is right today, though time of day could be better.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 2 guilds with Pro.

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Evidence
ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

Salmon run timing
2024 season

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
1
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.

Ranked for today
Atlantic Salmon fly box
Permits & access
Permit required — see local rules.
  • Very limited rods and advance booking are standard, but Grímsa is more about scarce intimate water than sheer river scale
  • Catch-and-release and current river-specific rules should be checked before fishing.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Norðlingafljót
30 km
Brown trout · Char
Þverá/Kjarará
43 km
Salmon
Vatnsdalsá
51 km
Salmon · Brown trout
Laxá í Dölum
54 km
Salmon
Norðurá
57 km
Brown trout · Salmon
Gallery · 2
  1. Tröllafossar rapids on the Grímsá, turbulent white water in a rocky channel.
    Tröllafossar rapids, Grímsá
  2. Terrain map of the venue
    Terrain map
Why this score · for Atlantic Salmon
  • Temperature10030% weight
  • Flow6025% weight
  • Clarity9520% weight
  • Feeding Time5015% weight
  • Pressure8510% weight
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Salmon 24 June → 30 September
Related guides
Atlantic Salmonsalmon tacticsEuro Nymphingsubsurface methods
Booking & contacts