Stillwater · Volcanic · Honshū

Lake Chūzenji

Mount nantai and lake chuzenji

Lake Chūzenji lies high above Nikkō, dammed by an old lava flow from Mount Nantai, and it carries a curious history: brown trout brought in by foreign residents more than a century ago, which took hold and grow large in the cold mountain water.

Marginal · Trout
Cicada (foam semi pattern) · 6-10
A patient day, if you fancy it
Good wave on — drift country. Slow going — pick your moments and do not force it.
40% confidence
limited data
What moved it
  • WindSW 8 km/hLight breeze
Today's fly
CI
Cicada (foam semi pattern)6-10
High-confidence seasonal pick
Conditions on the water
Live gauge
Wind
Light breeze
SW 8 km/h
N
SW
from the south-west
WaveRipple
Water temp
Air temp18°C
CloudOvercast
Pressure1011 hPa
Rain · recent0.0 mm

Some readings unavailable — check directly before fishing.

How to fish it · for Trout
When
Spring and autumn in the cold mountain water
Where
Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.
The plan
Plan A

Set up a broadside drift and cover the water systematically. Work a bushy searching pattern on the bob and drop a contrasting nymph on the point.

Plan B

If the main plan is not working, switch to a smaller, more imitative pattern fished slower and deeper. A change of drift angle can also make a difference.

Watch for

Evening tends to be the best period in summer — stay late if you can for a sedge or spinner fall.

Boat — drift

A gentle ripple is ideal for drifting — broadside drift covering the wind lanes should be productive.

Sub-surface · on the nymphunder the surface

Hatch predictions

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Beyond the hatch · worth watchingambient prey

Hatch predictions

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Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Black MidgeHatch
2
3
3
3
3
3
3
3
3
3
3
2
Daddy Long LegsHatch
2
3
2
Lake OliveHatch
1
2
2
2
2
2
1
Silverhorns & LonghornsHatch
1
2
2
2
1

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

Ranked for today
Trout fly box
Permits & access
Permit required — see local rules.
  • Local permit/charge and seasonal rules apply on this managed lake; confirm the current year.
What's coming
Plan ahead
5-day outlook
Condition match
73%
Cloud50%
Wind100%
Temp60%

A good match for Lake Chūzenji — most conditions are close to what it fishes best in.

Gallery · 2
  1. Mount nantai and lake chuzenji
    Mountain lake in Nikkō National Park.
  2. Terrain map of the venue
    Terrain map
About this water

Lake Chūzenji lies high above Nikkō, dammed by an old lava flow from Mount Nantai, and it carries a curious history: brown trout brought in by foreign residents more than a century ago, which took hold and grow large in the cold mountain water. A place of shrines, waterfalls and autumn maples, and a rare Japanese lake where the brown trout is the prize.

Under the surface

A high volcanic lake above Nikkō, formed when Nantai's lava dammed the valley — cold, deep and steeped in temple history. Brown trout introduced by early foreign residents thrive alongside char and kokanee, against a backdrop of shrines, falls and turning maples.

Wading: High cold lake, steep forested banks — boat/shore

  • Lake
  • Volcanic
  • Stillwater
  • Drop off
Why this score
  • Wind conditions (ripple) closely match what this water fishes best in.
Directions
Seasons & zones
  • Char late February to Aprillate September to mid-October

    Honshu/Shikoku/Kyushu keiryu are managed by local fishery co-operatives — a yugyoken (day/annual ticket) is required, and most streams close around 30 September / mid-October for spawning. Species are surfaced in prose only (no engine slugs for yamame, amago or iwana). Legal status: guidance_not_permission.

Related guides
Booking & contacts