Eifel fly-fishing river around Gerolstein and the upper Kyll. A practical western Germany trout and grayling venue, usually accessed through local accommodation, clubs or day permits rather than open public wandering.
- Eifel limestone volcanic
Water temperature for rainbow trout
Warm — slow23°C est.ideal 10–18°C
0°14°28°
How to fish it · for rainbow trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
⛔ Water at 22.5°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayQuiet day
Hatch predictions
See the full hour-by-hour hatch timeline 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
Top prey shown — see all 2 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
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
Rainbow Trout fly box
6-10 · Pattern
Swing
Permits & access
Permit required — see local rules.
- Fischereischein plus local Erlaubnisschein required
- Beat-specific rules are important on the Kyll.
What's coming
Plan ahead
5-day outlook
Water here around 23°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
Sankt Thomas Brücke mit Nepomuk Terrain map
About this water
The full read · show the working · for rainbow trout · confidence 90%
How the 12 is built — score × weight = contribution
Temperature6 × 28%1.7
Flow60 × 22%13.2
Clarity85 × 18%15.3
Feeding Time60 × 13%7.8
Pressure75 × 7%5.3
Insect activity55 × 12%6.6
Limiting factor: Water temperature (22.5°C) is outside Rainbow Trout's preferred range (10–18°C)= 50
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–18 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Troutlocal permit calendar → local permit calendar
- Graylinglocal permit calendar → local permit calendar
Grayling rules are state and fishery specific. Verify local Kyll permits before targeting grayling.
Related guides
Booking & contacts
Kyll (Gerolstein / Upper Kyll)
Contributor photo
Sankt Thomas Brücke mit Nepomuk
Palauenc05 (https://commons.wikimedia.org/wiki/User:Palauenc05) - CC BY-SA
Eifel fly-fishing river around Gerolstein and the upper Kyll.
Water temperature for rainbow trout
Warm — slow23°C est.ideal 10–18°C
0°14°28°
How to fish it · for rainbow trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
⛔ Water at 22.5°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayQuiet day
Hatch predictions
See the full hour-by-hour hatch timeline 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
Top prey shown — see all 2 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
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
Rainbow Trout fly box
6-10 · Pattern
Swing
Permits & access
Permit required — see local rules.
- Fischereischein plus local Erlaubnisschein required
- Beat-specific rules are important on the Kyll.
What's coming
Plan ahead
5-day outlook
Water here around 23°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
Sankt Thomas Brücke mit Nepomuk Terrain map
About this water
Eifel fly-fishing river around Gerolstein and the upper Kyll. A practical western Germany trout and grayling venue, usually accessed through local accommodation, clubs or day permits rather than open public wandering.
- Eifel limestone volcanic
The full read · show the working · for rainbow trout · confidence 90%
How the 12 is built — score × weight = contribution
Temperature6 × 28%1.7
Flow60 × 22%13.2
Clarity85 × 18%15.3
Feeding Time60 × 13%7.8
Pressure75 × 7%5.3
Insect activity55 × 12%6.6
Limiting factor: Water temperature (22.5°C) is outside Rainbow Trout's preferred range (10–18°C)= 50
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–18 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
- Troutlocal permit calendar → local permit calendar
- Graylinglocal permit calendar → local permit calendar
Grayling rules are state and fishery specific. Verify local Kyll permits before targeting grayling.
Related guides
Booking & contacts