More changes are coming to Highway 101.

The southbound off-ramp at Olive Mill/Spring Road in Montecito has been closed, and the southbound off-ramp at San Ysidro Road is open as crews continue to work on the Highway 101 widening project.

On Tuesday, Kirsten Ayars, spokeswoman for the Highway 101 project and president of the public relations firm Ayars & Associates, announced that crews finished work on the San Ysidro southbound off-ramp, allowing them to reopen the exit before moving on to the southbound Olive Mill/Spring Road ramp.

Ayars added that crews finished the new auxiliary lane last week — a day ahead of schedule. The crews were working to finish construction in the area before the storms, which could have delayed the reopening of the southbound San Ysidro ramp.

She said it was important to reopen the ramp on schedule.

“That ramp gets used by a lot of people trying to get to Montecito Union and to the Upper Village, and things like that,” Ayars said.

While the southbound Olive Mill exit is closed, crews will install an updated storm drain system, a new off-ramp, and a new sound wall between the ramp and the Butterfly Lane undercrossing.

“Just be aware of changes to the ramps,” Ayars said, “because if you’re driving southbound, if you used to get off at Olive, you now get off at San Ysidro.”

The southbound Olive Mill/Spring Road exit is expected to be closed until the spring.

Crews are also working on the southbound bridges over Oak, San Ysidro and Romero creeks. The new bridges will be wider and will be able to withstand a 100-year storm.

The northbound bridges were completed last year.

The project is part of the highway rewidening project, which has been adding additional lanes and other functions to Highway 101. The project has been split into multiple parts, with the Santa Barbara section being the final phase of the project.

The entire project was divided into five segments, allowing local governments to pay for the construction as each phase was set to begin. The Santa Barbara County Association of Governments secured the final $134 million for the remaining Santa Barbara section in July.

The entire cost for the upgraded highway will be $700 million.

SBCAG also celebrated the completion of the Padaro and Summerland portions of the project in April. Although construction is complete in those areas, crews are still working on landscaping and irrigation in the Padaro segment.