Freestone · Sedimentary · Honshū

Tama River (upper / Okutama)

Tama River, Mitake Valley

Guilhem Vellut - CC BY 2.0

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.

Species

About as good as it gets

Low and clear — careful approach country. Take your time — read the water before you cast.

The water temperature is around 17°C, about where the trout want it, sitting at a steady height, running clear.

90% confidence in this read
Water temperature for rainbow trout
Ideal
17°C est.ideal 10–18°C
0°14°28°
The full read · show the working · for rainbow trout · confidence 90%
How the 80 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time55 × 13%7.2
Pressure75 × 7%5.3
Insect activity57 × 12%6.8
Conditions total= 80
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Conditions
○Regional est.
Level
Light rain recently
No gauge reading
Water temp
16.9°C
Estimated
Clarity
Clear
Air temp
19°C
Wind
SW 8 km/h
Light breeze
Pressure
1020 hPa
Rain · 48h
5.5 mm
Light rain
Rain · ahead
5.1 mm
Light 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 12 active hatches hour by hour with Pro.

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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
Excellent — water temperature is right today, though time of day could be better.
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 · 2
  1. Tama River, Mitake Valley
    Upper Tama at Mitake Valley
  2. Terrain map of the venue
    Terrain map
Permits & access
Permit required — see local rules.
  • Local co-operative yugyoken required (day/annual ticket); managed stocked reaches with method rules
  • Confirm before fishing.
Directions
Apple MapsGoogle Maps
About this water

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. 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
Seasons & zones
  • Charlate February to April → late September to mid-October
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