The Baikal-Amur Mainline (BAM) is the largest railway passing through the territory of Eastern Siberia and the Far East in the direction of Taishet — Sovetskaya Gavan.
In 1960–1970, Lengiprotrans developed a project for the BAM Chara — Tynda section with a length of about 670 km. The route was laid in the region of the Olekma-Vitim mountainous country through rugged ridges dissected by river valleys. On the Chara — Tynda line, the institute designed 798 artificial structures, including 25 large railway bridges and 1 flyover.
A large railway bridge across the Imangru River was erected at 1367 km of BAM. The structure is designed according to the scheme 4x66 m, with a length of 278 m. The spans are metal, with a ride from the bottom with welded elements and assembly joints on high-strength bolts. The supports are made of monolithic concrete and reinforced concrete. The foundations of the supports were installed on shells with a diameter of 1.6 m, one abutment was installed on a natural foundation.
