Okina Bridge: A Hidden Art Deco Gem in Tsuyama's Historic Castle Town
Tucked within the charming Josai (Castle West) district of Tsuyama City in Okayama Prefecture, Okina Bridge is a small but remarkable piece of Japan's modern civil engineering heritage. Spanning the Ida River along the former Izumo Kaidō highway, this reinforced concrete bridge dates back to 1926 and is one of the few surviving bridges in Japan whose original brick pavement remains fully intact beneath its surface. Designated as a nationally Registered Tangible Cultural Property and recognized as a JSCE Heritage of Civil Engineering, Okina Bridge tells a fascinating story of Taishō-era modernization, Art Deco design, and the evolution of a castle town into the modern age.
Historical Background
The history of Okina Bridge stretches back to the early Edo period. When the Mori clan established Tsuyama Castle and developed the surrounding castle town, the Ida River (also known as the Okina River) required a permanent crossing along the Izumo Kaidō—the major highway connecting western Honshu to Izumo Province. A wooden bridge called Okina Bridge was constructed at this location, and in 1678 (Enpō 6), an eastern guard station was established at its approach, where sentries were permanently stationed. By 1682 (Tenna 2), official notice boards and barrier gates were installed, effectively turning the bridge approach into a checkpoint. These facilities remained in place until the early Meiji era.
In 1926 (Taishō 15), the aging wooden bridge was replaced with a modern reinforced concrete T-girder bridge, designed by Nakayama Ihei. The contractor was Suzuki Shunpei, and the stonework was carried out by Kurakake Komatarō, whose names are engraved on the bridge's ornamental pillars. At the time of its construction, the bridge deck was paved with brick—a common practice for quality road surfaces during the Taishō and early Shōwa periods.
Why Okina Bridge Was Designated a Cultural Property
Okina Bridge was registered as a national Registered Tangible Cultural Property (Building) on October 14, 1999. The designation recognized its value as a well-preserved example of Taishō-era reinforced concrete bridge construction, and particularly noted the Art Deco-style decorative elements on its four large balustrade pillars. The bridge's linear, geometric ornamentation reflects the Art Deco aesthetic that was highly fashionable in Japan during the 1920s.
In 2022, its significance was further elevated when it was selected as a JSCE (Japan Society of Civil Engineers) Heritage of Civil Engineering—the 10th such designation in Okayama Prefecture. The primary reason was the remarkable discovery, made during a routine bridge inspection in 2019, that the original brick pavement laid in 1926 survived in its entirety beneath the modern asphalt surface. A full excavation in December 2021 confirmed that the brick paving remained across the entire bridge deck—an extraordinarily rare survival nationwide.
Architectural and Design Highlights
Though modest in scale—with a bridge length of approximately 10 meters and a width of about 9.8 meters—Okina Bridge possesses several features that make it architecturally noteworthy.
The most striking visual elements are the four large ornamental balustrade pillars at the bridge's corners. These pillars feature bold, rectilinear geometric patterns characteristic of the Art Deco style, with clean lines and stepped profiles that contrast beautifully with the traditional white-walled townhouses and Meiji-era Western-style buildings that line the surrounding streetscape.
Below the modern road surface, the complete original brick pavement has been preserved. Following the 2022 JSCE Heritage designation, the city carried out a thoughtful restoration: two sections of the sidewalk were fitted with reinforced glass viewing windows, allowing visitors to see the original Taishō-era bricks in situ. The remaining sidewalk areas feature colored pavement designed to replicate the brick pattern, offering a visual echo of the bridge's hidden heritage.
Visitor Information
Okina Bridge is freely accessible at all times, as it remains an active roadway within Tsuyama's Josai Traditional Building Preservation District. Visitors can walk across the bridge and observe the Art Deco pillars up close, and peer through the glass sidewalk panels to view the original brick pavement below.
The bridge is located approximately a 15-minute walk west of JR Tsuyama Station. By car, it is about 5 kilometers from the Tsuyama Interchange on the Chūgoku Expressway. The surrounding Josai district is best explored on foot, as the narrow streets and historic architecture reward leisurely strolling.
Surrounding Attractions
Okina Bridge sits at the heart of Tsuyama's Josai Traditional Building Preservation District, which was designated as a national Important Preservation District for Groups of Traditional Buildings (Jūdenken) in December 2020. The district preserves a remarkable array of historic architecture spanning from the Edo period through the Taishō era.
Just a short walk away is the Sakushū Mingei-kan (Sakushū Folk Craft Museum), housed in the former Doi Bank Tsuyama Branch, a handsome pseudo-Western-style building constructed in 1909 and also a Registered Tangible Cultural Property. The Nishi-Teramachi temple quarter, with its concentration of 13 historic temples, offers a peaceful contrast to the commercial streetscape.
Tsuyama Castle (Kakuzan Park), one of Japan's 100 Fine Castles, is within easy walking distance. Its magnificent 45-meter stone walls and the reconstructed Bicchū Turret are must-see attractions, especially during cherry blossom season when approximately 1,000 trees bloom across the castle grounds. The Tsuyama Railroad Educational Museum, featuring Japan's second-largest surviving fan-shaped locomotive roundhouse, is another popular destination near the station.
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Q＆A
- What is special about the brick pavement on Okina Bridge?
- The original brick paving laid in 1926 survives in its entirety beneath the modern asphalt surface. This is extraordinarily rare in Japan. Two reinforced glass panels have been installed in the sidewalk so visitors can view the historic bricks in situ.
- Is there an admission fee to visit Okina Bridge?
- No. Okina Bridge is an active public roadway and can be visited freely at any time. The glass viewing panels in the sidewalk are also accessible without charge.
- How do I get to Okina Bridge from JR Tsuyama Station?
- The bridge is approximately a 15-minute walk west of JR Tsuyama Station. Head west along the former Izumo Kaidō highway through the Josai district. By car, it is about 5 km from the Tsuyama Interchange on the Chūgoku Expressway.
- What is the Art Deco design on the bridge?
- The four large ornamental pillars at the corners of the bridge feature bold geometric patterns in the Art Deco style, which was highly popular in Japan during the 1920s. Their clean, linear design adds a striking modern accent to the traditional townscape.
- What other cultural properties can I see near Okina Bridge?
- The surrounding Josai Traditional Building Preservation District contains numerous historic structures, including the Sakushū Folk Craft Museum (former Doi Bank, 1909), several Edo-period temples, and traditional merchant townhouses. Tsuyama Castle is also within walking distance.
Basic Information
| Name | Okina Bridge (翁橋) |
|---|---|
| Location | Nishi-Imamachi, Tsuyama City, Okayama Prefecture |
| Owner | Tsuyama City |
| Year of Construction | 1926 (Taishō 15) |
| Designer | Nakayama Ihei |
| Structure | Reinforced concrete T-girder bridge |
| Dimensions | Bridge length: approx. 10 m; Width: approx. 9.8 m |
| Cultural Property Designation | Registered Tangible Cultural Property (Building), registered October 14, 1999 |
| Other Designations | JSCE Heritage of Civil Engineering (2022) |
| Access | Approx. 15-minute walk from JR Tsuyama Station; approx. 5 km from Tsuyama IC on the Chūgoku Expressway |
References
- 翁橋 – Cultural Heritage Online (bunka.nii.ac.jp)
- https://bunka.nii.ac.jp/heritages/detail/137168
- 翁橋 – Wikipedia
- https://ja.wikipedia.org/wiki/%E7%BF%81%E6%A9%8B
- 翁橋で発見された煉瓦舗装について – 津山市公式サイト
- https://www.city.tsuyama.lg.jp/life/index2.php?id=8071
- 翁橋 – 土木学会 選奨土木遺産
- https://committees.jsce.or.jp/heritage/node/1237
- 国指定文化財等データベース – 文化庁
- https://kunishitei.bunka.go.jp/heritage/detail/101/00005903
- 重伝建のまち並み – 城西まちづくり協議会
- https://josai-machidukuri.com/judenken/
- 津山市城西重伝建地区 – 津山まちじゅう博物館
- https://tsuyama-machijuu.jp/guide/josai/
Last verified: 2026.04.08