Freestone · Volcanic · Vesturland

Grímsa

Tröllafossar rapids on the Grímsá, turbulent white water in a rocky channel.

Classic west Iceland spate river, intimate and pool-rich.

Good · Atlantic Salmon
Green Butt · 12-16 doubles
Goodlive now
A good day — worth the effort
Low and clear — careful approach country. Small, sparse flies, long leader, careful approach.
50% confidence
What moved it
  • LevelLight rain recentlyNo gauge reading
  • Water temp9.3°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 temp9.3°C
ClarityClear
Weather4°C
WindN 17 km/h
Pressure1005 hPa
Rain · recent2.8 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
Cool — slow
9°C est.ideal 1014°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
Good — water clarity is working for you, but time of day is the limiting factor today.
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 4 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 · July 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
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
About this water

Classic west Iceland spate river, intimate and pool-rich. One of the country's most productive salmon rivers per rod-day. Excellent dry fly and hitch water. Volcanic bedrock underlies this river. Iceland's salmon are managed conservatively under operator and national rules — quotas, size limits and catch-and-release are widely applied; check the river's rules before fishing.

Under the surface

Grímsá rises near Reyðarvatn and runs some thirty-two kilometres down Lundarreykjardalur to join the great Hvítá system in Borgarfjörður, the most prolific salmon country in west Iceland and barely an hour from Reykjavík. A medium river by Icelandic measure, it carries around sixty named pools over volcanic rock, the most famous being the Laxfoss, where the water tips over a ledge beneath the lodge cliff and holds taking fish through the season. The character is classic Borgarfjörður: clear freestone glides and ledge pools on a moderate gradient, double-bank water shared by only eight rods so each has room. It is a river with tradition worn into it, fished by visiting anglers since the late nineteenth century. Wading is straightforward on firm volcanic gravel, with care needed on the smooth rock around the falls.

Wading: Smooth rock around the Laxfoss ledge

  • River
  • Volcanic
  • Partly confined
  • Pool riffle
  • Step pool
Why this score · for Atlantic Salmon
  • Temperature8330% weight
  • Flow6025% weight
  • Clarity9520% weight
  • Feeding Time1015% weight
  • Pressure8510% weight
Directions
Seasons & zones
  • Salmon 24 June30 September
Related guides
Booking & contacts