Public Relation

Tokyo Water Attractive Spots

Tamagawajosui Headrace

Tamagawajosui Headrace

Tamagawajosui Headrace is an approximately 43km long waterway that was excavated without timbering, which stretches from Hamura to Yotsuya Ookido. It was made for the purpose of supplying water into the city of Edo.
In 1652, the Shogunate (Japan’s feudal government) had made a grand plan to take in the water from the Tama River into Edo, and appointed Shouzaemon and Seiemon brothers as the construction contractors.
The construction started in 1653, and it was open-cut in just 8 months. Stone and wooden gutters were installed as distribution pipes in the basement of Toranomon by June of the following year, and water was supplied to the southwest part of the city including the Edo Castle, Yotsuya, Kojimachi, the plateau of Akasaka, Shiba, and Kyobashi area. The brothers who served greatly for the construction, were given the surname of Tamagawa as a reward.
It was designed to make the water flow for the length of 43km by using only a 92m difference in elevation. This reveals the advanced technology of that time.
In 2003, it celebrated the 350th open-cut anniversary, and it has been designated as a national historic landmark. It functions today as a water conveyance channel for raw water supply.

General Information

Name Tamagawajosui Headrace
Location/Access Hamura- City, Fussa City, Akishima City, Tachikawa City, Kodaira City, Koganei -City, Nishi-Tokyo City, Mushino- City, Mitaka- City, Suginami-City, Setagaya-City, Shibuya-City,For the Walk Map please checkherePDF3.27MB)
Current Purpose
  • Upper Basin(Approx. 12km from Hamura Intake Weir to the Kodaira Observation Point)
    Headrace of Raw Water Supply
  • Middle Basin(Approx. 18km from the Kodaira Observation Point to Sengembashi)
    Fresh Stream Restoration Project
    (Downstream from the Saki Sakai Purification Plant)
  • Drainage
    Lower Basin(Approx. 13km from Sengembashi to Yotsuya Ookido)

●Statue of the Tamagawa Brothers

The big brother Shoemon, is holding a ”Kennawa (measuring rope)” a surveying instrument at that time, and the one sitting with the ”Kenzao (measuring rod)” is the little brother Seiemon.

Statue of the Tamagawa Brothers