Freestone · Sedimentary · Honshū, JP

Tama River (upper / Okutama)

Tama River, Mitake Valley

The upper Tama at Okutama is Tokyo's mountain river — cold, managed keiryu within reach of the city, stocked and looked after by the local co-operative, where yamame, iwana and rainbows hold in clear pools beneath wooded ridges.

Today · A proper day on the water
Sculpin Streamer
Forecast · Today
A proper day on the water
A proper day for it. Work the seams with an upstream nymph, switch to the dry when they show.
75% projected
Today's fly
Sculpin Streamer
Sculpin Streamer
Conditions on the water · Today
Estimate
Level
Dry recently
No gauge reading
Water temp7.9°C
ClarityClearing
Weather14°C
WindN 10 km/h
Pressure1013 hPa
Rain · recent0.3 mm
Rain · ahead0.1 mm

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

Water temperature for White-spotted Char
Ideal
8°C est.ideal 7–14°C
0°14°28°
How to fish it · for White-spotted Char
When
Spring to the autumn closure
Where
The upper Tama at Okutama is Tokyo's mountain river — cold, managed keiryu within reach of the city, stocked and looked after by the local co-operative, where…
Why this works
Good — water temperature is right today, though river flow could be better.
Hatch timeline · todayPeak at 6am

12pm(now) — Autumn Needle Fly

Stage: Creeping nymphsApproach: Heavy nymphActivity: 38%
Also:Black Midge35%Autumn Olive29%
Peak emergence window7 food groups active

Peak activity at 6am — Kajika Sculpin (Japan) (Kajika Sculpin (Japan), 3 food groups active)

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 3 as a supporter.

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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · October highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Stenopsyche CaddisHatch
2
3
3
2
Cicada (Semi)Hatch
2
2
Ephemera strigata (Mid-Reach Keiryu Mayfly)Hatch
2
3
3
3
2
Epeorus latifolium (Riffle Mayfly)Hatch
2
3
3
3
3
3
2

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

Ranked for today
White-spotted Char fly box
EH
Elk Hair / Stenopsyche caddis
12–14 · Sedge
Evening sedge — twitch or dead-drift it as the light goes.
CB
Cicada & beetle terrestrials (midsummer)
10–12 · Terrestrial
Fish it tight to the bank on warm, breezy days.
Permits & access
Permit required — see local rules.
  • Local co-operative yugyoken required (day/annual ticket); managed stocked reaches with method rules
  • Confirm before fishing.
What's coming
Plan ahead
5-day outlook
Gallery · 2
  1. Tama River, Mitake Valley
    Upper Tama at Mitake Valley
  2. Terrain map of the venue
    Terrain map
About this water

The accessible face of Japanese stream fishing, busy but genuine.

Under the surface

Tokyo's home mountain river, running cold and clear through the wooded Okutama hills within reach of the city. A managed, stocked co-operative water — yamame, iwana and rainbow in pools and pocket runs — busy at weekends but a true keiryu all the same.

Wading: Accessible but slick rock, weekend crowds

  • River
  • Sedimentary
  • Partly confined
  • Pool riffle
  • Pocket water
Conservation note

Stocked rainbow with wild white-spotted char (iwana) and yamame.

The full read · show the working · for White-spotted Char · confidence 75%
How the 77 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow45 × 22%9.9
Clarity95 × 18%17.1
Feeding Time80 × 13%10.4
Pressure75 × 7%5.3
Insect activity56 × 12%6.7
Conditions total= 77
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Char late February to April → late 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
Euro Nymphingsubsurface methods
Booking & contacts
At a glance

Tama River (upper / Okutama) is a freestone river in Honshū — Tokyo (Okutama), Japan. Its recorded elevation is about 350 m above sea level and the catchment geology is sedimentary. Our data lists rainbow trout, white spotted char and yamame here. Best window recorded for anglers: Spring to the autumn closure. Core methods listed: Tenkara (fixed-line); dry-dropper; nymphing.