Mayflies
- Ecology: Good
- Chemical: Unknown
WFD classification · NO002-1666-R
Rules at a glance
- Permit required
Water temperature for Brown Trout
Cool — slow9°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the open Norwegian trout season — June through September. Browns share the grayling water but hold differently.
Where
Pool tails, undercut banks, and the deeper edges of glides. Browns sit on structure where grayling shoal in open water.
Method
Dry to risers; nymph the deeper holds when no rise. The water's clear — long leader, fine tippet, careful approach.
Kit
9 ft #4 single-hander. Floating line, 12 ft leader to 4 to 5 lb fluoro.
Why this works
Good — water clarity is right today, though insect activity could be better.
Likely species
Mayflies
- Large dark oliveMost likely#14–16 · EmergerDead-drift the emerger — it's sitting in the film.
- Green drakeAlso possibleLower confidence#8–10 · DunDuns are up — the Spent Gnat spinners fall at dusk.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 4 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
See what else is on the menu with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalModerate confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
1
Grayling seasonSeason
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
Brown Trout fly box
Permits & access
Permit required — see local rules.
- Local fiskekort required for the Kvennan beat or controlling association
- Inland trout-and-grayling rules apply here; this is not an anadromous salmon river requiring the national salmon fee.
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
Gallery · 2
River at Dusk Terrain map
Water quality (WFD)
The full read · show the working · for Brown Trout · confidence 75%
How the 75 is built — score × weight = contribution
Temperature77 × 28%21.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity46 × 12%5.5
Conditions total= 75
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 June → 15 September
- Grayling 1 June → 15 September
Related guides
Booking & contacts
Glomma (Kvennan)
Water temperature for Brown Trout
Cool — slow9°C est.ideal 10–16°C
0°14°28°
How to fish it · for Brown Trout
When
Through the open Norwegian trout season — June through September. Browns share the grayling water but hold differently.
Where
Pool tails, undercut banks, and the deeper edges of glides. Browns sit on structure where grayling shoal in open water.
Method
Dry to risers; nymph the deeper holds when no rise. The water's clear — long leader, fine tippet, careful approach.
Kit
9 ft #4 single-hander. Floating line, 12 ft leader to 4 to 5 lb fluoro.
Why this works
Good — water clarity is right today, though insect activity could be better.
Likely species
Mayflies
- Large dark oliveMost likely#14–16 · EmergerDead-drift the emerger — it's sitting in the film.
- Green drakeAlso possibleLower confidence#8–10 · DunDuns are up — the Spent Gnat spinners fall at dusk.
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 4 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 2 guilds with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey
Hatch predictions
See what else is on the menu with Pro.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalModerate confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · August highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
1
Grayling seasonSeason
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
Brown Trout fly box
Permits & access
Permit required — see local rules.
- Local fiskekort required for the Kvennan beat or controlling association
- Inland trout-and-grayling rules apply here; this is not an anadromous salmon river requiring the national salmon fee.
What's coming
Plan ahead
5-day outlook
Other water nearby · 2
Gallery · 2
River at Dusk Terrain map
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · NO002-1666-R
The full read · show the working · for Brown Trout · confidence 75%
How the 75 is built — score × weight = contribution
Temperature77 × 28%21.6
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity46 × 12%5.5
Conditions total= 75
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout 1 June → 15 September
- Grayling 1 June → 15 September
Related guides
Booking & contacts