Lake Okutama is an artificial lake formed by Ogouchi Dam located
upstream of Tama River.
It is located about 60 km west of central Tokyo, and the west part of the lake extends into Yamanashi Prefecture.
The dam took 19 years to build because of interruption of
construction by the war, then was completed in 1957.
During the construction, 87 workers died in some accidents, so the memorial has been built.
There is a museum about this dam near the bus stop. (The name is "Mizu to midori no fureaikan" (Museum of water and trees).)
On the lake, there are two floating bridges with many floats.
In past days, drums had been used as the floats. So it is called "drum can bridge".
We can walk across the bridges.
Tokyo Sky Tree