The 2011 off the Pacific coast of Tohoku Earthquake and Tsunami caused damage to the Kesengawa Bridge on the Ofunato Line, operated by East Japan Railway Company, with some of its steel girders and piers washed away. The Kesen River, which intersects with the damaged bridge, has been a clear stream representing Iwate Prefecture, where sweetfish and salmon fishing are popular. For this reason, the period during which restoration work that would muddy the river could be carried out was limited to two and a half months a year, avoiding the upstream and spawning seasons.Since reusing the remaining piers would lead to a reduction in the amount of river construction work, we investigated the soundness of the remaining piers and adopted a repair plan that utilizes the healthy parts. Adopting this plan not only minimized the impact on the river environment, but also contributed to the reduction of construction wastes and carbon dioxide emissions associated with new construction.In addition, three piers that had to be newly constructed due to the washout were located in the flowing water area, so we used the steel sheet pile foundations, as both cofferdams and the permanent structures.As a result, we were able to construct piers inside the steel sheet piles, which minimized the impact on the river environment and enabled restoration in a short period.