The Utah Department of Transportation celebrated Monday hitting the halfway point for a $335 million project to extend the Mountain View Corridor highway from 4100 South to State Road 201.

But that comes with some road closures there during evenings this week on the State Road 201 freeway where it will soon connect with the new west-side highway at about 5700 West.

On Monday and Tuesday, eastbound lanes on S.R. 201 will close there from 9 p.m. to 5 a.m. On Wednesday and Thursday, the westbound lanes will close during the same hours. That will allow crews to set beams for a new the Mountain View Corridor bridge over S.R. 201.

UDOT spokesman John Gleason said the new 4-mile extension that is now halfway complete “is significant because for the first time, Mountain View will connect with a major east-west route, and that’s when people are going to really see benefits from this corridor.”

Mountain View already has been completed between 10600 South in Bluffdale and 4100 South in West Valley City, a 17-mile stretch. Eventually, it will cover nearly 34 miles between Interstate 80 in Salt Lake City to State Road 73 in Lehi, and over time will become a full freeway itself.

“It’s really going to change how people drive on the west side,” Gleason said. “In the decade to come, Mountain View Corridor is going to be one of the most heavily traveled highways out there because of growth on the west side.”

The new section will have two lanes in each direction, 13 bridges, six pedestrian bridges and a trail system. The project also includes the ongoing widening of a nearby intersection at 3500 South and 5600 West.

Much of the new section of the highway will be elevated, requiring 2.5 million cubic yards of fill material — the equivalent of filling both the football stadiums at the University of Utah and Brigham Young University to the top.

Construction began last summer, and is scheduled to continue through the summer of 2021.