Freestone · Volcanic · Vesturland, IS

Grímsa

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

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

Tomorrow · Closed season
Forecast · Tomorrow
Closed season
Out of season. File this water for the right month.
50% projected
Conditions on the water · Tomorrow
Live gauge
Level
Falling
1.41 m
Dropping after lift
Water temp0.9°C
ClarityClearing
Weather-4°C
WindN 12 km/h
Pressure987 hPa
Rain · recent2.7 mm
Rain · ahead1.3 mm

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

Water temperature for Atlantic Salmon
Too cold
1°C est.ideal 10–16°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.
Hatch timeline · tomorrowQuiet day

Low insect activity predicted today

Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Salmon run timing
2024 season

Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Salmon runRun
1
2
2
1
Nordic SpringflyHatch
2
3
3
2
Ladoga CaddisHatch
2
3
2
Evening SedgeHatch
2
3
3
3
2
Arctic Cased CaddisHatch
1
2
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
  • Temperature030% weight
  • Flow6025% weight
  • Clarity9520% weight
  • Feeding Time8515% weight
  • Pressure8510% weight
Directions
Seasons & zones
  • Salmon 24 June → 30 September
Related guides
Booking & contacts