It was founded in the mid-1970s, as part of the construction of the long
Severomuysky Tunnel on the
Baikal–Amur Mainline (BAM). It was granted urban-type settlement status in 1977. As the construction of the tunnel turned out to be more difficult than anticipated, construction was prolonged over twenty years and Severomuysk remained the logistical center for tunnel construction works for far longer than originally intended. With the economic downturn of the 1990s and the completion of the tunnel in 2003, the settlement lost over two thirds of its population. ==Administrative and municipal status==