Meisei Iro Bridge, Stone arch irrigation bridge in Takeda, Japan.

Meisei Iro Bridge is a six-arch stone irrigation bridge over the Ogata River in Takeda, Oita Prefecture. Completed in 1919, it carries the Meisei Iro canal across the river and over Oita Prefectural Route 8. Its arches have a span of 10.7 m and a rise of 3.3 m, with 60 cm thick ring stones, and four tiers of stone walls are stacked above the arches. The bridge is 78.0 m long, 13.0 m high and 2.8 m wide.

The bridge was completed in 1919, marking an important advance in Japanese irrigation engineering during the late Meiji and early Taisho periods. Its construction enabled the expansion of water distribution systems that transformed the region's agricultural development.

The name "Meisei" comes from the plan and works spanning the Meiji and Taisho eras. The Meisei Iro canal draws from the Ogata, Kanbara and Ono rivers and runs 175 km, of which 48 km are main lines and 127 km distribution channels, serving about 717 ha of paddies across 2,323 ha in Ogata and Kiyokawa. The bridge is managed by the Meisei Land Improvement District.

The bridge is accessible on foot, offering good views of the stonework and river landscape from multiple angles. Visit on clear days to fully appreciate the details of the arches and the engineering of the structure.

This is one of Japan's largest stone arch irrigation bridges and was recognized as a Selected Civil Engineering Heritage site in 2002. The designation highlights its special place in the history of Japanese infrastructure development.