MARSHALL — It’s been a summer of detours for Minnesota Highway 91, but by the end of the week the highway should be open to traffic in Nobles, Murray and Lyon County, the Minnesota Department of Transportation said.

All detours on Highway 91 are expected to be removed Friday, MnDOT said. The contractor for the 45-mile construction project has completed all required work for this season, plus six miles of pavement from Adrian to Lismore.

Construction on Highway 91 this year spanned two different MnDOT districts, and three counties. The project required four different detours for motorists. One detour, for the segment of highway between Russell and U.S. Highway 14, was delayed several times, and was only removed in late October.

Other detours were in place for a segment of the highway in Murray County between Murray County Roads 10 and 20, a segment between Adrian and Lismore, and a segment between Lismore and Lake Wilson.

MnDOT engineers said delays in construction were caused by a combination of factors, including bad weather and scheduling by the project contractor. The Highway 91 construction was a two-year contract, involving highway reconstruction and bridge and culvert repair. Rather than doing the culvert repair in one year and paving the next, the project contractor completed additional work this year.

There’s still some work left to do on the Highway 91 project, but it won’t involve closing the road, MnDOT said. Final paving of the highway, grass seeding and striping will hall happen next spring. The work should be finished in late June.