OSHKOSH, WI (WTAQ) - Three weeks ahead of schedule, a major interchange in Oshkosh will open Monday evening.

The Wisconsin Department of Transportation says the Highway 41-21 interchange will open by 5 p.m. Monday. The interchange has been closed for 7 months.

The $54 million project added roundabouts, and Highway 21 will now pass over 41, rather than under it. 

The work on US 41 and the Lake Butte des Morts bridge in the Oshkosh area will be completed by the end of July 2013.