- Ecology: Moderate
- Chemical: Unknown
WFD classification · DERW_DEBW_44-01
Rules at a glance
- Licence required
Water temperature for Rainbow Trout
Warm — slow20°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 19.9°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6am
Hatch predictions
Today's headline hatch shown — see all 9 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 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
2
2
2
1
Grayling seasonSeason
1
2
2
2
2
2
2
1
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Rainbow Trout fly box
Permits & access
Permit required — see local rules.
- Black Forest tributary
- Fischereischein + Erlaubnisschein required.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 4
Water here around 20°C — probably warm enough to stress Rainbow Trout . These are likely cooler.
Gallery · 2
Calw-Hirsau Nagold Terrain map
Water quality (WFD)
The full read · show the working · for Rainbow Trout · confidence 80%
How the 28 is built — score × weight = contribution
Temperature32 × 28%9.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time70 × 13%9.1
Pressure75 × 7%5.3
Insect activity63 × 12%7.6
Conditions total= 64
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Murgproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–18 °C ideal band — would lift the score and ease welfare.
Directions
Seasons & zones
- Trout 1 March → 30 September
- Grayling 1 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.
Season dates are set at state or regional level — confirm the local rules.
Prime sport 1 August → 30 November
Related guides
Booking & contacts
Nagold
Water temperature for Rainbow Trout
Warm — slow20°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 19.9°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6am
Hatch predictions
Today's headline hatch shown — see all 9 active hatches hour by hour with Pro.
Start free trial14-day free trial. Cancel anytime.
Beyond the hatch · worth watchingambient prey(1)
Hatch predictions
Top prey shown — see all 3 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
2
2
2
1
Grayling seasonSeason
1
2
2
2
2
2
2
1
Evening SedgeHatch
2
3
3
3
2
Large Dark OliveHatch
1
2
2
1
Iron BlueHatch
1
2
2
2
2
2
2
1
Blue Winged OliveHatch
1
2
2
2
2
1
Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.
Ranked for today
Rainbow Trout fly box
Permits & access
Permit required — see local rules.
- Black Forest tributary
- Fischereischein + Erlaubnisschein required.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 4
Water here around 20°C — probably warm enough to stress Rainbow Trout . These are likely cooler.
Gallery · 2
Calw-Hirsau Nagold Terrain map
Water quality (WFD)
- Ecology: Moderate
- Chemical: Unknown
WFD classification · DERW_DEBW_44-01
The full read · show the working · for Rainbow Trout · confidence 80%
How the 28 is built — score × weight = contribution
Temperature32 × 28%9.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time70 × 13%9.1
Pressure75 × 7%5.3
Insect activity63 × 12%7.6
Conditions total= 64
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Murgproxy
Prey activitysurvey-backed invertebrate datasurvey
What would change the calculation
Cooler water — back toward the 10–18 °C ideal band — would lift the score and ease welfare.
Directions
Seasons & zones
- Trout 1 March → 30 September
- Grayling 1 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.
Season dates are set at state or regional level — confirm the local rules.
Prime sport 1 August → 30 November
Related guides
Booking & contacts