Large River · Volcanic · South Iceland, IS

Þjórsá

A fly angler stands on volcanic rocks casting into the wide, powerful rapids of the Thjorsa river in Iceland, with green hills in the background.

Iceland's longest river.

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
1.93 m
Dropping after lift
Water temp2.7°C
ClarityClearing
Weather-1°C
WindN 21 km/h
Pressure986 hPa
Rain · recent8.5 mm
Rain · ahead0.0 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
3°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

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Supporters see what else is on the menu.

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Evidence
Records-basedModerate confidence

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

Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
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.
  • Major nationwide salmon river
  • Permits via local operators and clubs
  • Some beats less pressured than famous rivers.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 3
  1. A fly angler stands on volcanic rocks casting into the wide, powerful rapids of the Thjorsa river in Iceland, with green hills in the background.
    Salmon Fishing on the River Thjorsa, Iceland
  2. Photo of Þjórsá
    Þjórsá
  3. Terrain map of the venue
    Terrain map
About this water

Iceland's longest river. Major salmon and trout drainage with extensive productive water. Less intensive commercial operation than premium named rivers but excellent fishing opportunity. 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

Þjórsá is the longest river in Iceland — some two hundred and thirty kilometres from the Hofsjökull ice down across the southern lowland to the sea, draining a basin of more than seven thousand square kilometres with its great tributary the Tungná. It is a true glacial river, grey and opaque with meltwater, tracking for much of its lower course the edge of the Great Þjórsá Lava, the largest single lava flow on Earth since the last ice age, laid down some 8,600 years ago. Despite the murk it carries one of the largest wild salmon stocks in the country — unusually, fish that spawn and grow in glacial water, a rarity worldwide — most of them pushing through past Urriðafoss in June. This is big, powerful, silt-laden water on a broad gradient. Wading is bold work in poor visibility; read the lava-edged channel rather than the bottom.

Wading: Poor visibility in silt laden glacial water

  • River
  • Volcanic
  • Unconfined
  • Large river
Related guides
Booking & contacts
Permits & access