The Reservoir on the Hill
The last stop in Toyohashi's first water system sits on high ground east of the Kotakano purification plant. This is the old distribution reservoir at the Tame distribution station, completed in 1929 (Shōwa 4). Once the water had been filtered, it was sent up here and held before flowing down to the city. Because the reservoir stands at an elevation of around 54 meters, gravity alone could carry the supply to homes below, with no further pumping needed.
The reservoir is a roofed, half-buried rectangular tank of reinforced concrete, covering about 1,230 square meters. Its above-ground part is covered over with earth, so from a distance it reads less like a structure and more like a low, grassy rise in the landscape. That earth cover kept the stored water cool and steady, a simple and durable solution.
Small Buildings With Pointed Arches
What gives the reservoir its character are the two small management buildings set at the center of its east and west ends. They were finished with real elegance: tile-clad outer walls and doorways shaped with pointed arches, a touch closer to chapel design than to waterworks. Against the plain green mound of the buried tank, these tidy little structures stand out as the designed face of the site.
The whole municipal waterworks was planned under Nishiōeda Satoru, an engineer who had worked on Tokyo's water system, and it began full service after the opening ceremony of March 1930. The Tame reservoir completed the chain: river intake at Gejō, the aqueduct bridge over the Ōe River, filtration and pumping at Kotakano, and finally storage and distribution here on the hill.
A Record of an Era
The reservoir keeps the layout of an early-Shōwa purification and distribution complex largely intact, which is why it was valued. Together with the other four registered sites, it shows how a 1920s city assembled a complete, working water supply and gave even its buried tanks a considered design.
It was registered as a Tangible Cultural Property on 2 November 2018, the last listed of the five Toyohashi waterworks structures, recognized for its contribution to the historic landscape of the country. As part of the city's water network it is not freely open to visitors, but the earth-covered mound and its arched gatehouses remain a quiet landmark above the eastern edge of Toyohashi.
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Q&A
- What did this reservoir do?
- It stored treated water on high ground so that it could flow down to the city by gravity. It was the final stage of Toyohashi's first municipal water system.
- Why is it covered with earth?
- The tank is a half-buried, roofed structure with soil laid over the top. The earth cover helped keep the stored water at a steady temperature and protected the tank, while letting the reservoir blend into the hillside.
- What are the small buildings on it?
- They are management buildings at the east and west ends of the reservoir, finished with tile-clad walls and pointed-arch doorways. They are the most visible and most decorative part of the site.
- When was it built and registered?
- It was completed in 1929 (Shōwa 4) and registered as a Tangible Cultural Property on 2 November 2018, the last of the five Toyohashi waterworks structures listed that day.
- Can it be visited?
- The distribution station is part of the working water network and is not generally open to the public. For any access information, contact the Toyohashi City Waterworks and Sewerage Bureau.
Basic Information
| Name | Tame Distribution Station Old Distribution Reservoir, Toyohashi Municipal Waterworks (Tame Haisuijō Kyū Haisuichi) |
|---|---|
| Location | 33-149 Semikawa, Tame-chō, Toyohashi, Aichi |
| Designation | Registered Tangible Cultural Property (civil structure) |
| Registered | 2 November 2018 (registration no. 23-0529) |
| Built | 1929 (Shōwa 4) |
| Count and structure | 1 unit; reinforced concrete, area 1,230 sq m, roofed half-underground tank, earth-covered |
| Owner | Toyohashi City Waterworks and Sewerage Bureau |
| Access | Part of the active water network; not generally open to the public |
References
- Agency for Cultural Affairs, National Cultural Properties Database: Tame Old Distribution Reservoir
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00012558
- Toyohashi City Waterworks and Sewerage Bureau: History of the Water Supply
- https://www.city.toyohashi.lg.jp/3984.htm
- Toyohashi City Waterworks and Sewerage Bureau: Water Facilities
- https://www.city.toyohashi.lg.jp/3925.htm
Last verified: 2026.06.25