Tama River
Also known as: Tamagawa, Mitake/Okutama
Mitake Gorge - one of Japan's 100 best waters; forested cliffs, Sawanoi sake brewery riverside, seasonal foliage
Is there water?
Whether there is a river here on your dates, and what kind of water it is.
Rain-fed mountain river; regulated by upstream Ogouchi Dam (Lake Okutama); typhoon (Aug-Oct) rain raises flows
Approx Apr-Nov (Confirm. operator dates)
Spring to autumn; peak Jul-Aug-Sep; foliage in autumn
Cool mountain water even in summer (~15-20C est); wetsuits provided; early/late season cold
Heavy rain / typhoon spikes raise levels and can cancel tours; flash-rise possible below dam releases
Grade & who can come
A river changes grade with its level. These grades describe a normal flow - in flood the same run is harder, and often a different run entirely. Check the gauge before you commit.
Grade 1-2 commercial rafting; Class 3 boulder garden at Mitake (slalom section)
Rafting; kayak (slalom)
Rafts family-sized; kids welcome; kayak/slalom separate; packraft options
Very accessible - ~5 min walk from JR Mitake Stn; ~1h10 from Shinjuku; from elementary 1st grade
The run
Steady flow safe for beginners; the Mitake bridge boulder garden is a class-3 slalom/instruction spot; higher flow after rain
Boulder garden pins/wraps for kayakers; beginner rafting low-hazard; obey operator go/no-go
Mitake Gorge (Mitake to Sawai/Ozaku)
Busy on summer weekends given Tokyo proximity; slalom paddlers and university clubs frequent
Access & shuttle
Operator tour fee (Confirm. current price); no general river permit
Permits and operators change - confirm before booking.
Put-in near Mitake (Mitake Stn area); take-out downstream toward Sawai/Ozaku
JR Ome line rail access; operator shuttles short; easy day trip from central Tokyo
No river camps; Okutama/Mitake lodging, day facilities
Wetsuit/PFD/helmet by operator; good mobile coverage; short run
Canyons (Okutama); Gekiryu; Tokyo Snow Club; at-tama.tokyo operators
Hazards & exits
Post-rain / dam-release level rises; crowded weekends; kayaker pin risk in boulder garden
Rail/road-accessible; short gorge; operator safety cover; Tokyo emergency services close
Guided for commercial rafting; independent kayakers self-support
This profile is desk research, compiled from public sources - not a first-hand river run report. Coordinates are approximate.