Eastern Black Forest river, gentler gradient than the western streams with mixed brown trout and some rainbow. Club-managed beats with variable access. A river that rewards patient local knowledge.
- Sandstone
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 23.1°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
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
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
1
2
2
2
2
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
Rainbow Trout fly box
6-10 · Pattern
Swing
Permits & access
Permit required — see local rules.
- Black Forest tributary
- Fischereischein + Erlaubnisschein required.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Probably above the rainbow trout safety line — these are likely cooler, but carry a thermometer.
Gallery · 2
Calw-Hirsau Nagold Terrain map
About this water
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
WFD classification · DERW_DEBW_44-01
The full read · show the working · for rainbow trout · confidence 90%
How the 4 is built — score × weight = contribution
Temperature2 × 28%0.6
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time60 × 13%7.8
Pressure75 × 7%5.3
Insect activity52 × 12%6.2
Limiting factor: Water temperature (23.1°C) is outside Rainbow Trout's preferred range (10–18°C)= 53
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Murgproxy
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
- Trout1 March → 30 September
- Grayling1 May → 31 December
Baden-Württemberg state rule: grayling (Äsche) closed 1 January – 30 April. Open season 1 May – 31 December. Individual fishing association (Fischereiverein) rules may apply. Always check the specific permit.
Related guides
Booking & contacts
Nagold
Contributor photo
Calw-Hirsau Nagold
MSeses (https://commons.wikimedia.org/wiki/User:MSeses) - CC BY-SA
Eastern Black Forest river, gentler gradient than the western streams with mixed brown trout and some rainbow.
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 23.1°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
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
Trout seasonSeason
1
2
2
2
2
2
1
Grayling seasonSeason
1
2
2
2
2
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
Rainbow Trout fly box
6-10 · Pattern
Swing
Permits & access
Permit required — see local rules.
- Black Forest tributary
- Fischereischein + Erlaubnisschein required.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 2
Probably above the rainbow trout safety line — these are likely cooler, but carry a thermometer.
Gallery · 2
Calw-Hirsau Nagold Terrain map
About this water
Eastern Black Forest river, gentler gradient than the western streams with mixed brown trout and some rainbow. Club-managed beats with variable access. A river that rewards patient local knowledge.
- Sandstone
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
WFD classification · DERW_DEBW_44-01
The full read · show the working · for rainbow trout · confidence 90%
How the 4 is built — score × weight = contribution
Temperature2 × 28%0.6
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time60 × 13%7.8
Pressure75 × 7%5.3
Insect activity52 × 12%6.2
Limiting factor: Water temperature (23.1°C) is outside Rainbow Trout's preferred range (10–18°C)= 53
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Murgproxy
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
- Trout1 March → 30 September
- Grayling1 May → 31 December
Baden-Württemberg state rule: grayling (Äsche) closed 1 January – 30 April. Open season 1 May – 31 December. Individual fishing association (Fischereiverein) rules may apply. Always check the specific permit.
Related guides
Booking & contacts