Central Swiss river flowing into Lake Lucerne, limestone-clear water with brown trout. Technical fishing in water so clear the fish know you're there. Strong caddis and olive hatches.
- Limestone
Water temperature for grayling
Warm — slow14.9°Cideal 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.
Why this works
Poor — river flow 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 2 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read 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
ModelledModerate confidence
Modelled from regional ecology — no survey or occurrence data for this water yet.
Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
1
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
1
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Grayling fly box
Permits & access
Permit required — see local rules.
- Zentralschweizer Fluss mit kantonalen Vorschriften; vor dem Angeln unbedingt die genauen Anforderungen für Schwyz und angrenzende Gewässer prüfen, statt sich auf eine allgemeine Zentralschweiz-Angabe zu verlassen.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Gallery · 2
Muota Terrain map
About this water
The full read · show the working · for grayling · confidence 55%
How the 20 is built — score × weight = contribution
Temperature72 × 28%20.2
Flow80 × 22%17.6
Clarity10 × 18%1.8
Feeding Time10 × 13%1.3
Pressure80 × 7%5.6
Insect activity37 × 12%4.4
Limiting factor: Water is unfishable — too coloured for Grayling= 51
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout1 April → 15 September
Related guides
Booking & contacts
Muota
Contributor photo
Muota
Yesuitus2001 at German Wikipedia / Wikimedia Commons
Central Swiss river flowing into Lake Lucerne, limestone-clear water with brown trout.
Water temperature for grayling
Warm — slow14.9°Cideal 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.
Why this works
Poor — river flow 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 2 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
See the full sub-surface read 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
ModelledModerate confidence
Modelled from regional ecology — no survey or occurrence data for this water yet.
Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
1
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2
Alpine RhithrogenaHatch
1
2
2
1
Large Dark OliveHatch
1
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Grayling fly box
Permits & access
Permit required — see local rules.
- Zentralschweizer Fluss mit kantonalen Vorschriften; vor dem Angeln unbedingt die genauen Anforderungen für Schwyz und angrenzende Gewässer prüfen, statt sich auf eine allgemeine Zentralschweiz-Angabe zu verlassen.
What's coming
Plan ahead
5-day outlook
Other water nearby · 1
Gallery · 2
Muota Terrain map
About this water
Central Swiss river flowing into Lake Lucerne, limestone-clear water with brown trout. Technical fishing in water so clear the fish know you're there. Strong caddis and olive hatches.
- Limestone
The full read · show the working · for grayling · confidence 55%
How the 20 is built — score × weight = contribution
Temperature72 × 28%20.2
Flow80 × 22%17.6
Clarity10 × 18%1.8
Feeding Time10 × 13%1.3
Pressure80 × 7%5.6
Insect activity37 × 12%4.4
Limiting factor: Water is unfishable — too coloured for Grayling= 51
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Trout1 April → 15 September
Related guides
Booking & contacts