Shikokumura Ishifune Arch Bridge

A Pilgrimage Bridge That Moved House

The Shikoku Mura Ishibune Arch Bridge (四国村石舟のアーチ橋, Shikoku-mura Ishibune no Āchi-kyō) is a single-span stone arch built in 1901 and now standing at the Shikoku Mura open-air museum in Yashima-Nakamachi, Takamatsu, Kagawa Prefecture; it was entered on Japan's register of Tangible Cultural Properties on 28 April 2000.

It did not start there. The bridge was built at Ishibune in Shinmyō, in what was then Kokubunji-chō of Ayauta County and is now part of Takamatsu, on one of the Konpira Kaidō routes that carried pilgrims toward Kotohira-gū. Everyone walking that stretch crossed it. When the prefectural road was widened, the bridge was donated to the museum along with a stone storehouse from the same locality, and it was reassembled at Yashima in 1982.

The span is small. The Agency for Cultural Affairs records an overall length of 4.6 metres and an arch span of roughly three metres; the museum gives the span as three metres, the width as 4.5 metres and the height as three metres. It is wider than it is long, which tells you something about what it was for: not a scenic crossing but a working piece of road, sized to take foot traffic and packhorses over a modest watercourse without anyone breaking stride.

The Stone, and the Men Who Cut It

The material came from Washinoyama in Kokubunji, a hornblende andesite quarried close to where the bridge was built. Kagawa has been a stone province for a very long time, and this bridge is a local product in the fullest sense: local rock, local masons, a local road.

The masons signed it. Cut into the lower edge of the keystone, along with the year of construction, are the names Toshio Yojirō and Toshio Yonekichi. Signed civil works of this scale are not common. A pair of provincial stonemasons in 1901 put their names on a three-metre arch over a country stream, and a century later those names are the reason a great deal is known about the bridge at all.

They also allowed themselves some fun. The keystone carries relief carving on both faces, and the two faces do not match. One shows a Chinese lion with peonies, a pairing loaded with associations of strength and prosperity. The other shows a carp climbing a waterfall, which in East Asian tradition is the image of persistence rewarded, the fish that becomes a dragon. According to the museum, the carvings were originally coloured.

Set that against the arch itself, which is plain voussoir work with no decorative pretension, and the effect is of craftsmen who did the structural job properly and then spent their remaining effort on the one stone everybody would look at.

Seeing It at Shikoku Mura

The registration criterion applied to the bridge is the one for structures that would not be easy to reproduce. That is a fair reading. Cut-stone arch construction of this kind depended on masons who could shape voussoirs to a curve by eye and hand, and the trade has largely gone.

The bridge is one of more than thirty relocated structures at Shikoku Mura, a museum of Shikoku vernacular and industrial architecture spread across the wooded lower slopes of Yashima. Almost everything on the site is designated or registered in some form, and many of the neighbouring items are stone: a Konpira stone lantern of 1794, a standing night lantern of 1855, stone storehouses brought from Shōdoshima. The bridge sits comfortably among them, and because visitors cross it rather than view it from a distance, its arch is one of the few things on the site you experience with your feet.

Look at the keystones before you cross. They are on the outer faces of the arch, at the crown, and are easy to walk straight past.

Practical Details

Shikoku Mura opens from 9:30 to 17:00, with last admission at 16:30, and closes on Tuesdays; when a Tuesday falls on a public holiday, the closure moves to the following day. Admission is 1,600 yen for adults, 1,000 yen for university students on production of a student card, 600 yen for junior and senior high school students, and free for elementary school children and younger. The site closes in severe weather when a warning is issued for the Takamatsu area. Photography for personal use is normal practice at the museum, though its rules should be checked at the entrance.

The museum is a five-minute walk from Kotoden-Yashima Station on the Kotoden Shido Line and about ten minutes from Yashima Station on the JR Kōtoku Line. Free parking is available and is shared with Yashima Shrine, which stands immediately west. Allow one to two hours for the grounds; the terrain is sloping and partly unpaved, so sensible shoes help. A free multilingual audio guide app covers the site in English, French, Chinese and Korean as well as Japanese.