Caddisflies
Gammarids
Glacial influence in summer colors the main stem; tributaries often offer better fly water than the main channel. Part of the Danube basin trout-grayling zone.
- Limestone
Rules at a glance
- Licence required
Water temperature for Hucho
Cool — slow8°C est.ideal 8–14°C
0°14°28°
How to fish it · for Hucho
When
April–September
Where
Large river flowing from Austria through Rosenheim to Passau, grayling, brown trout, and huchen in the system.
Why this works
Excellent conditions for huchen. Baitfish present across pool heads and slower runs — cover both systematically.
Likely species
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 6 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · November 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
Hucho fly box
10–14cm · Fly
Olive, tan, and natural-toned baitfish imitations match the primary prey of huchen — dace, juvenile chub, and grayling fry.
8–12cm · Fly
A precise imitation for selective conditions on clear rivers such as the Una, Dunajec gorge, and Kolpa.
Permits & access
Permit required — see local rules.
- Large Alpine river (Bavaria/Austria border)
- Fischereischein + Erlaubnisschein required.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
Passau, Innkai Terrain map
About this water
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · DERW_DEBY_1_F552
Directions
Seasons & zones
- Trout 1 March → 30 September
- Grayling 1 May → 31 December
Bavaria state rule: grayling (Äsche) closed 1 January – 30 April, minimum size 35 cm. Open season 1 May – 31 December. Individual fishery/Hegering may impose stricter rules or shorter access. Always check the specific permit (Fischereischein + Fischereiberechtigung). C&R recommended on classified trout/grayling waters.
Season dates are set at state or regional level — confirm the local rules.
Prime sport 1 August → 30 November
Related guides
Booking & contacts
Inn (Bavaria)
Large river flowing from Austria through Rosenheim to Passau, grayling, brown trout, and huchen in the system.
Water temperature for Hucho
Cool — slow8°C est.ideal 8–14°C
0°14°28°
How to fish it · for Hucho
When
April–September
Where
Large river flowing from Austria through Rosenheim to Passau, grayling, brown trout, and huchen in the system.
Why this works
Excellent conditions for huchen. Baitfish present across pool heads and slower runs — cover both systematically.
Likely species
Hatch timeline · todayQuiet day
Hatch predictions
Today's headline hatch shown — see all 6 active hatches hour by hour as a supporter.
Start free trial14-day free trial. Cancel anytime.
Sub-surface · on the nymphunder the surface
Hatch predictions
Top nymph shown — see all 4 guilds as a supporter.
Start free trial14-day free trial. Cancel anytime.
Evidence
Survey-backed · regionalHigh confidence
Backed by regional invertebrate surveys; no sampling on this exact reach yet.
Through the year
0–3 scale · November 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
Hucho fly box
10–14cm · Fly
Olive, tan, and natural-toned baitfish imitations match the primary prey of huchen — dace, juvenile chub, and grayling fry.
8–12cm · Fly
A precise imitation for selective conditions on clear rivers such as the Una, Dunajec gorge, and Kolpa.
Permits & access
Permit required — see local rules.
- Large Alpine river (Bavaria/Austria border)
- Fischereischein + Erlaubnisschein required.
What's coming
Plan ahead
5-day outlook
Other water nearby · 5
Gallery · 2
Passau, Innkai Terrain map
About this water
Glacial influence in summer colors the main stem; tributaries often offer better fly water than the main channel. Part of the Danube basin trout-grayling zone.
- Limestone
Water quality (WFD)
- Ecology: Good
- Chemical: Unknown
WFD classification · DERW_DEBY_1_F552
Directions
Seasons & zones
- Trout 1 March → 30 September
- Grayling 1 May → 31 December
Bavaria state rule: grayling (Äsche) closed 1 January – 30 April, minimum size 35 cm. Open season 1 May – 31 December. Individual fishery/Hegering may impose stricter rules or shorter access. Always check the specific permit (Fischereischein + Fischereiberechtigung). C&R recommended on classified trout/grayling waters.
Season dates are set at state or regional level — confirm the local rules.
Prime sport 1 August → 30 November
Related guides
Booking & contacts
At a glance
Inn (Bavaria) is a freestone river in Bavaria / Rosenheim, Germany. Its recorded elevation is about 451 m above sea level and the catchment geology is limestone. The river is described as roughly 218 km long. Our data lists brown trout, grayling and hucho here. The trout season is recorded as running from 1 March to 30 September. The grayling season is recorded as running from 1 May to 31 December. Best window recorded for anglers: April–September. Core methods listed: nymph; dry fly; streamer. Level and flow data for this water is linked from 1 gauge. Its Water Framework Directive ecological status is recorded as good. Nearby waters in our listings include Traun (Bavaria) at 41 km, Traun — Rudi Heger waters at 41 km and Förchensee at 42 km.