Freestone · Limestone · Bavaria / Rosenheim

Inn (Bavaria)

Inn (Bavaria) — Passau, Innkai
Contributor photo

Passau, Innkai

_-0-_ (https://www.flickr.com/photos/85759247@N04) - CC BY

Large river flowing from Austria through Rosenheim to Passau, grayling, brown trout, and huchen in the system.

Marginal · Brown Trout
Elk Hair Caddis · 12-16
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • LevelDry recentlyNo gauge reading
  • Water temp18.4°C
  • ClarityVery coloured
Today’s fly
Elk Hair Caddis
Elk Hair Caddis12-16
Upstream dry
Conditions on the water
Estimate
Level
Dry recently
No gauge reading
Water temp18.4°C
ClarityVery coloured
Weather17°C
WindSW 9 km/h
Pressure1017 hPa
Rain · recent0.0 mm
Rain · ahead6.7 mm

No gauge on this water — readings are regional estimates from weather, not a live gauge.

Water temperature for brown trout
Warm — slow
18°C est.ideal 10–16°C
0°14°28°
How to fish it · for brown 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 18.4°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — barometric pressure is in the right range.
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 2 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Top nymph shown — see all 3 guilds with Pro.

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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
Brown Trout fly box
SS
Small Streamer
6-10 · Pattern
Swing
Permits & access
Permit required — see local rules.
  • Großer Alpenfluss (Grenzgebiet Bayern/Österreich)
  • Fischereischein + Erlaubnisschein erforderlich.
What's coming
Plan ahead
5-day outlook
Water here around 18°C. Nothing cooler within range — carry a thermometer.
Gallery · 2
  1. Inn (Bavaria) — Passau, Innkai
    Passau, Innkai
  2. Terrain map of the venue
    Terrain map
About this water

Large river flowing from Austria through Rosenheim to Passau, grayling, brown trout, and huchen in the system. 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

The full read · show the working · for brown trout · confidence 80%
How the 30 is built — score × weight = contribution
Temperature49 × 28%13.7
Flow41 × 22%9.0
Clarity15 × 18%2.7
Feeding Time40 × 13%5.2
Pressure80 × 7%5.6
Insect activity31 × 12%3.7
Limiting factor: Water is very coloured — too coloured for Brown Trout= 40
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 10–16 °C ideal band — would lift the score and ease welfare.
A drop and clear would lift the flow and clarity scores.
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout1 March → 30 September
  • Grayling1 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.

Related guides
Hucho / Danube Salmonspecialist apex-predator guideGrayling Playbookgrayling tacticsEuro Nymphingsubsurface methods
Booking & contacts