Extremely low water levels have caused the temporary closure of an area border crossing.

For the first time ever, owners of the Sombra Ferry Service have been forced to do a major rebuild of their dock so both their vessels can cross the St. Clair River.

It takes all of four minutes to get across on the Sombra Ferry Service, but on Tuesday, travellers Mary Lenoyne and her partner were land-locked.

"You don't have to wait here this long. The trucks aren't on usually this route, so with the bridge you have a lot of truck traffic so the border tends to get piled up," says Lenoyne.

The Sombra Ferry dock is undergoing a major rebuild to compensate for water levels that have dropped as much as two feet.

Bluewater Ferry owner Rob Dalgety says since 2012, he's had to reduce the number of vehicles crossing.

"When you're really busy on the weekend, losing three cars every trip that's, well every four trips you're losing a full boat," he said.

Lakes Huron and Michigan hit their lowest levels ever earlier this year and continue a 14 year stretch of below average levels.

Work is expected to be completed by week's end.