Freestone · Limestone · Bavaria / Munich

Isar

Photo of Isar
Poor · Rainbow Trout
Elk Hair Caddis · 12-16
Poorlive now
Not the day for it
River dropping into shape after a lift. Not much stacked in your favour today. Worth an hour if you are nearby, not worth the special trip.
90% confidence
What moved it
  • Level0.89 mDropping after lift
  • Water temp22.1°C
  • ClarityVery colouredColouring up
Today's fly
Elk Hair Caddis
Elk Hair Caddis12-16
Upstream dry
Conditions on the water
Live gauge
Level
Steady
0.89 m
Dropping after lift
Water temp22.1°C
ClarityVery coloured
Weather23°C
WindNE 9 km/h
Pressure1022 hPa
Rain · recent0.0 mm
Rain · ahead2.9 mm

Live readings only. Trends shown where the gauge supports them.

Water temperature for Rainbow Trout
Warm — slow
22.1°Cideal 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 22.1°C. This is the line where catch-and-release kills brown trout. Do not fish for them today.
Hatch timeline · todayPeak at 6pm

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

See the full sub-surface read with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 2 with Pro.

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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
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
SS
Small Streamer
6-10 · Pattern
Swing
Permits & access
Permit required — see local rules.
  • Oberbayerischer Fluss
  • Fischereischein plus Erlaubnisschein erforderlich.
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here at 22.1°C — too warm to fish Rainbow Trout safely. These are cooler.
Upper Ammer
47 km
~12°C
Brown trout · Grayling
Gallery · 2
  1. Photo of Isar
    Isar
  2. Terrain map of the venue
    Terrain map
Water quality (WFD)
  • Ecology: Good
  • Chemical: Unknown
What this classification means

WFD ecological status Moderate → Good corrected to EEA WISE 2022 (3rd RBMP) classification for waterbody DERW_DEBY_1_F402 (was a stale earlier-cycle value). Source: EEA WISE SWB_SurfaceWaterBody (discodata.eea.europa.eu), verified 2026-06-18.

WFD classification · DERW_DEBY_1_F402

The full read · show the working · for Rainbow Trout · confidence 90%
How the 15 is built — score × weight = contribution
Temperature10 × 28%2.8
Flow80 × 22%17.6
Clarity45 × 18%8.1
Feeding Time85 × 13%11.1
Pressure75 × 7%5.3
Insect activity50 × 12%6.0
Limiting factor: Water temperature (22.1°C) is outside Rainbow Trout's preferred range (10–18°C)= 51
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
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
Apple MapsGoogle Maps
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
Grayling Playbookgrayling tacticsEuro Nymphingsubsurface methods
Booking & contacts