The
Ust-Ilimsk Dam on the Angara (downstream from the older, bigger, and better known
Bratsk Dam), completed in the mid-1970s, not only backs up the Angara, but also the Ilim as far as
Zheleznogorsk-Ilimsky. The site of the old town of
Ilimsk was flooded by the reservoir. The Ilim is long, and its
basin covers . The river freezes up in late October and stays icebound until early May. Its main tributaries are the Kochenga and the Tuba from the right, and the Chora from the left. ==See also==