Stoneflies
Caddisflies
Gammarids
- Ecology: Unknown
- Chemical: Unknown
Rules at a glance
- Permit required
- Fly only
Water temperature for Grayling
Ideal6°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Likely species
Caddisflies
- CapererMost likelyLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
- Apatania (Arctic case-builder)Also possibleLower confidenceNearest relative#14–16–18 · NymphCold-water case-builder; compressed July-August window.
- Net-spinning caddisAlso possibleLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
Hatch timeline · tomorrowQuiet day
12h(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 16%
Low insect activity predicted today
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · September 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
Yellow SallyHatch
2
3
3
2
Nordic SpringflyHatch
2
3
3
2
Late March BrownHatch
2
3
2
Large Brook DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Grayling
Hook 14–18 · Fly
in season · matches water height
Permits & access
Permit required — see local rules.
- Local fiskekort required from Inatur.no or regional river manager
- Inland trout-and-grayling rules
- No national salmon fee.
What's coming
Plan ahead
5-day outlook
Gallery · 2
Storåne (Hallingdalselva), Hovet, Norway Terrain map
Water quality (WFD)
The full read · show the working · for Grayling · confidence 90%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time90 × 13%11.7
Pressure80 × 7%5.6
Insect activity58 × 12%7.0
Conditions total= 85
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 1 June → 15 September
- Grayling 1 June → 15 September
Related guides
Booking & contacts
Hallingdalselva
Water temperature for Grayling
Ideal6°C est.ideal 4–14°C
0°14°28°
How to fish it · for Grayling
When
Midday window — grayling feed best from late morning into early afternoon.
Where
Work runs and glides — grayling shoal in the bottom third of the water column.
Method
Tight-line nymph the bottom third with weighted patterns.
Kit
10 ft #3 rod, floating line, long leader to 4 lb fluoro for nymphs.
Likely species
Caddisflies
- CapererMost likelyLower confidence#10–12 · AdultBig autumn sedge; fish dry at last light.
- Green SedgeAlso possibleLower confidenceNearest relative#10–12–14–16 · NymphFree-living green caddis larva; fast stony riffles.
- Apatania (Arctic case-builder)Also possibleLower confidenceNearest relative#14–16–18 · NymphCold-water case-builder; compressed July-August window.
- Net-spinning caddisAlso possibleLower confidenceNearest relative#12–14–16 · PupaWidespread riffle net-spinner; evening emergence.
Hatch timeline · tomorrowQuiet day
12h(now) — Autumn Needle Fly
Stage: Creeping nymphsApproach: Heavy nymphActivity: 16%
Low insect activity predicted today
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · September 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
Yellow SallyHatch
2
3
3
2
Nordic SpringflyHatch
2
3
3
2
Late March BrownHatch
2
3
2
Large Brook DunHatch
2
3
2
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Fly box · Grayling
Hook 14–18 · Fly
in season · matches water height
Permits & access
Permit required — see local rules.
- Local fiskekort required from Inatur.no or regional river manager
- Inland trout-and-grayling rules
- No national salmon fee.
What's coming
Plan ahead
5-day outlook
Gallery · 2
Storåne (Hallingdalselva), Hovet, Norway Terrain map
Water quality (WFD)
- Ecology: Unknown
- Chemical: Unknown
The full read · show the working · for Grayling · confidence 90%
How the 0 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time90 × 13%11.7
Pressure80 × 7%5.6
Insect activity58 × 12%7.0
Conditions total= 85
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitysurvey-backed invertebrate datasurvey
Directions
Seasons & zones
- Trout 1 June → 15 September
- Grayling 1 June → 15 September
Related guides
Booking & contacts