Freestone · Volcanic · Honshū

Tadami River

Tadami River venue image
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The Tadami winds through the deep-snow wilderness of Oku-Aizu, a remote valley of dams, gorges and beech forest where iwana and yamame run wild and the railway threads the hillsides above the water.

Species

Slow going — pick your moments

Low and clear — careful approach country. Cover and shadow are doing the work today.

Sitting at a steady height, running clear, the water's warmed to around 18°C.

90% confidence in this read
Water temperature for brown trout
Warm — slow
18°C est.ideal 10–16°C
0°14°28°
The full read · show the working · for brown trout · confidence 90%
How the 39 is built — score × weight = contribution
Temperature54 × 28%15.1
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time75 × 13%9.8
Pressure80 × 7%5.6
Insect activity56 × 12%6.7
Conditions total= 72
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
Conditions
○Regional est.
Level
Dry recently
No gauge reading
Water temp
18.1°C
Estimated
Clarity
Clear
Air temp
20°C
Wind
W 8 km/h
Light breeze
Pressure
1013 hPa
Rain · 48h
0.6 mm
No meaningful rain
Rain · ahead
0.7 mm
No meaningful rain · next 48h

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

Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 8 active hatches hour by hour with Pro.

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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 18.1°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots. Otherwise poor — water clarity is in the right range.
Through the year
0–3 scale · June highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Stenopsyche CaddisHatch
2
3
3
2
Cicada (Semi)Hatch
2
2
GrannomHatch
2
2
Evening SedgeHatch
2
3
3
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Gallery · 1
  1. Terrain map of the venue
    Terrain map
Permits & access
Permit required — see local rules.
  • Co-operative yugyoken required; spawning closure in autumn
  • Confirm reach and access.
Directions
Apple MapsGoogle Maps
About this water

The Tadami winds through the deep-snow wilderness of Oku-Aizu, a remote valley of dams, gorges and beech forest where iwana and yamame run wild and the railway threads the hillsides above the water. Back-country keiryu, quiet and little-pressured, in some of Honshū's heaviest snow.

Under the surface

A remote river through the beech-forest snow country of Oku-Aizu, between dams and gorges, the famous Tadami railway clinging to the slopes above. Wild iwana and yamame in lightly fished water; deep winters and a short, green season.

Wading: Remote snow country access, swift water

  • River
  • Volcanic
  • Partly confined
  • Pool riffle
  • Pocket water
Seasons & zones
  • Charlate February to April → late September to mid-October
Water here around 18°C. Nothing cooler within range — carry a thermometer.
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