By the turn of the century, Boom Island was used by the large sawmills to store lumber while it was being dried. Later, a large sawmill was built on the island. Shortly after 1900, the Wisconsin Central Railroad used the lower end of Boom Island for a large rail yard. Local industries began to fill in the river channels, eventually turning Boom Island into toxic waste brownfield.
The railroads started to withdraw after WWII, and the Wisconsin Central abandoned Boom Island in 1970. The City of Minneapolis took over the island. The lower section was to be the site of the new Interstate-335 river crossing. The upper island was cleaned up and converted into a marina. Local tour boats use the space, and there is a public launch for private boats. The site is famous for one of the best views of the Minneapolis skyline at night. The park opened in 1987. The highway project has since been cancelled, so as of 2008, the lower island is being cleaned up.
As part of the restoration of Boom Island, one of the original river channels was reopened and used for the boat launch. The bridge on this page crosses that channel, which was once a backchannel between Boom Island and the east shore of the Mississippi River. The photo at the top of this page is looking west towards the famous lighthouse at the north end of the Boom Island channel.