Registered Tangible Cultural Properties of Japan

The Okutsu Oro-tani-gawa Intake Weir is a small 1932 gravity weir, 4.2 metres wide with an arched sediment outlet, feeding a branch canal of the scheme in Okayama.

The Okutsu Confluence Basin is a 160-metre reinforced-concrete channel of 1930 that gathers surplus and tailwater from the Kamisaihara station for reuse in Okayama.

The Okutsu Kirotani-gawa Intake Weir is a 12-metre gravity weir of 1932 whose intake gate, revetment and arched inlet all survive complete in Okayama.

The Okutsu No. 3 Aqueduct is an 18-metre reinforced-concrete three-span rigid-frame bridge of 1932 carrying a trapezoidal water flume over the Yu-no-tani-gawa in Okayama.

A 1933 elevated concrete regulating reservoir for the Okutsu power station in Kagamino, Okayama, registered in 2006, carried on a grid of columns.

The smallest registered structure of the Okutsu scheme in Kagamino, Okayama. Built in 1932, this 4.4 m weir is 1.5 m high and feeds a tributary into a branch canal.

A 1932 wall at Kagamino in Okayama, running about 185 m in granite laid diagonally, topped by a 0.85 m concrete balustrade and pierced by a spillway tunnel mouth.

A 1932 overflow weir on the upper Yoshii River in Kagamino, Okayama. About 34 m long and 3.3 m high, set on granite bedrock, with a curving stepped fish ladder.

A 1932 reinforced concrete aqueduct at Kagamino in Okayama, carrying the Okutsu headrace over the Orodani River on three 6.1 m bays with outward-flaring piers.

An 1887 police station in Ushimado, Setouchi, with a pediment, varied Western windows and faux-stone corners; now a museum of Korean embassies and festival floats.

The Kamisaibara Power Station Akawase River Intake Weir of 1930 is a 12 metre gravity weir on bedrock, faced in diagonally coursed granite, with a debris screen.

The Kamisaibara Power Station Ikego River Intake Weir of 1930 stands 3.1 metres high on the crest of a steep rock slope, with an arched sand flush outlet.

At 78 square metres, the Kamisaibara Power Station Ikego Channel Settling Basin of 1930 is the smallest of this station's nine registered structures on the Yoshii.

Built in 1930, the Kamisaibara Power Station Confluence Basin joins river water with the tailrace of an upstream station across 694 square metres of concrete.

The Kamisaibara Power Station Head Tank of 1930 ends the main channel, regulating flow to the powerhouse across 497 square metres of roughly triangular pond.

Ninety metres of 1930 stone walling, the Kamisaibara Power Station Penstock and Main Building Retaining Walls made level ground where the valley had almost none.

The Kamisaibara Power Station Tenno Channel Settling Basin of 1930 covers 134 square metres, settling sand and shedding surplus water over a west overflow weir.

Built in 1930 on the upper Yoshii River, the Kamisaibara Power Station Main Building is a concrete powerhouse with a flattened Pratt truss over its generator hall.

The Kamisaibara Power Station Yoshii River Intake Weir of 1930 spans the river on exposed bedrock, 30 metres long, keeping its fish ladder and six sluice gates.

An 1897 timber warehouse, 29 meters long, built to collect leaf tobacco under the state monopoly, now a free folk museum of 800-plus rural tools open on weekends.