The largest of the Soo Locks in operation will close Monday morning for emergency repairs.

The Lake Carriers’ Association announced Sunday morning on Twitter that the Poe Lock at Sault Ste. Marie, Mich., will close at 6:30 a.m. Monday for about 12 hours so emergency repairs can be made.

At 1,200 feet long, the Poe Lock currently is the only one of the Soo Locks able to handle the 1,000-foot lakers that move most of the cargo on the Great Lakes.

The Poe Lock was built in 1896 and rebuilt in 1968. President Donald Trump included $75 million in funding for a second 1,200-foot lock in his 2020 fiscal year budget request to Congress. The U.S. House passed the budget bill in June but still awaits Senate approval.

The Soo Locks received $922 million to build the new lock when Trump signed the America’s Water Infrastructure Act into law in October.