Superior Street is getting a face lift that means changes for the runners in the 42nd annual Grandma’s Marathon, the Garry Bjorklund Half Marathon, and the fans that want to watch it.

There is a modified Garry Bjorklund Half Marathon and Grandma's Marathon due to a construction project that is underway to transform downtown Duluth.

Historically, the Garry Bjorklund Half Marathon follows the same course as Grandma’s Marathon which runs along the shoreline of Lake Superior, through downtown Duluth, and finishes in Canal Park. That feature will not change as a majority of the course will remain the same.

The modification only affects a small portion that will temporarily be rerouted during Mile 11 of the Garry Bjorklund Half Marathon and Mile 24 of Grandma’s Marathon. As race participants make their way through downtown Duluth, they will continue along Superior Street until they cross 4th Avenue East. They will then make a left turn off of Superior Street and proceed down to Michigan Street the they will turn as normal on to 5th Avenue West near the Mile 25 mark to reconnect with the original course that guides them to the iconic finish line.

According to Grandma's Marathon, the reroute will be in effect for the 2018-2020 race seasons and is contingent on the phases of the City of Duluth’s reconstruction plan. The course has been measured and certified by USA Track and Field, and the modification has virtually no impact on the start or finish line locations.

Spectators will have limited access to the rerouted section of the course along Michigan Street, so race officials are recommending you make your plans according to the Grandma's website and the Superior St Website.