on several isolated sections:
* from Lake Baikal to Irkutsk
* from Irkutsk to Bratsk
* on the Ust-Ilimsk Reservoir
* from the Boguchany Dam (Kodinsk) to the river's fall into the Yenisey.

The section between the Ust-Ilimsk Dam and the Boguchany Dam has not been navigable due to rapids. However, with the completion of the Boguchany Dam, and filling of its reservoir, at least part of this section of the river will become navigable as well. Nonetheless, this will not enable through navigation from Lake Baikal to the Yenisey,