Public Relation

Tokyo Water Attractive Spots

Murayama Reservoir & Yamaguchi Reservoir(Lake Tama & Lake Sayama)

Water Conservation Forest

The Murayama Reservoir (Lake Tama) and Yamaguchi Reservoir (Lake Sayama) are earth dam reservoirs that are built using the Sayama Hills, which stretches across Tokyo and Saitama Prefecture.
The Murayama Reservoir is divided into, the Murayama Upper Reservoir on the west side (upstream) and the Murayama Lower Reservoir on the east side (downstream).
The Yamaguchi Reservoir is connected with the neighboring Murayama Reservoir by connecting pipes, and operated as one. It stores the Tama River water withdrawn from Ozaku Intake Weir as well as Hamura Intake Weir, and conveys water to the Higashi Murayama and Sakai Purification Plant.
From these dams, you can enjoy the abundance of rich nature throughout the seasons. The Okutama mountain views, sakura cherry blossoms in spring, autumn leaves, and bird watching are just a start.
The first Intake Tower of the Murayama Lower Reservoir has a heavyweight designed dome roof and tiled exterior wall with arch windows as an accent. This building is well-known as one of “Tokyo’’s Selected Historical Landmarks”, and is popular as the symbol of the reservoir.

General Information

Name The Murayama Upper & Lower Reservoir (Lake Tama)
The Yamaguchi Reservoir (Lake Sayama)
  • The Murayama Upper Reservoir
    Completed: March 1924
    Type: Earth Dam, 1 Intake Tower
    Height of Dam: 24.24m
    Length of Dam: 318.2m
    Available Storage Capacity: 2,983,000m3
  • The Murayama Lower Reservoir
    Completed: March 1927
    ( Reinforcement of the dam completed in Nov. 2008)
    Type: Earth Dam, 2 Intake Towers
    Height of Dam: 34.5m
    Length of Dam: 610.0m
    Available Storage Capacity: 11,843,00m3
  • The Yamaguchi Reservoir
    Completed: March 1934 (Reinforcement of the dam completed in November 2002)
    Type: Earth Dam, 2 Intake Towers
    Height of Dam: 33.9m
    Length of Dam: 716.0m
    Available Storage Capacity: 19,528,000m3
  • The Murayama Upper Reservoir  2226 6-Chome, Tamako, Higashi-Yamato-City
  • The Murayama Lower Reservoir  664 4-Chome, Tamako, Higashi-Yamato-City
    Seibu Tamako Line “Musashi Yamato Station” 16 min walk
  • The Yamaguchi Reservoir 25-2 Shourakuji, Tokorozawa-City, Saitama Prefecture
    Seibu Tamako Line“Seibukyujo-mae Station”15 min walk