Beach & Waterfront · Lake Okutama
Lake Okutama (Ogouchi Dam) 奥多摩湖（小河内ダム）
Mountain reservoir formed by the 149 m Ogouchi Dam, one of Japan's largest drinking-water reservoirs, with a lakeside walking road.
HoursNo fixed hours (dam observation areas and museum have daytime hours)
ClosedOpen daily
PriceFree
Getting thereOkutama Station (JR Ome Line), Nishi Tokyo bus to Okutama-ko, about 15 min
Time needed1.5-3 hours
Best timeEarly April for cherries; November for autumn leaves
Address5 Hara, Okutama-machi, Nishitama-gun, Tokyo
About
Lake Okutama was created when the Ogouchi Dam, finished in 1957 after 19 years of work, flooded the upper Tama valley to supply Tokyo with water. Visitors can walk along the dam crest and the observation deck for views over the lake, and follow the 12 km Lake Okutama Ikoi Road along the shore toward Yama-no-Furusato village. Cherry trees around the lake bloom in early April, and the surrounding mountains turn red in November.
Highlights
- Walk on the crest of the 149 m Ogouchi Dam
- Observation deck over the lake
- 12 km Lake Okutama Ikoi Road
- Floating bridges across the lake arms
Tips
- The Ikoi Road can close in bad weather or winter
- Buses back to Okutama Station are hourly at best
Open in Google Maps · Info checked 2026-10-10
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