Thrills And Spills On The St. Clair (GALLERY)

Thousands of people lined the Sarnia and Port Huron waterfronts Sunday as the fifth annual International Powerboat Festival came to a conclusion with thundering racing on the St. Clair River.

A couple of vessels overturned but there were no reports of any injuries.

Some of the boats reach speeds in excess of 200 km/h.

Perfect weather brought attendance over the three day festival, in Sarnia, to an estimated 40,000, which is 10,000 more than last year.

There were concerts Friday and Saturday night and various other activities and Greekfest relocated to the downtown this year, in conjunction with the powerboat event.

Powerboat racing on the St. Clair River August 9, 2015 (BlackburnNews.com photo by Dave Dentinger)

Powerboat racing on the St. Clair River August 9, 2015 (BlackburnNews.com photo by Dave Dentinger)

Crews come to the aid of an overturned powerboat in racing August 9, 2015 (BlackburnNews.com photo by Dave Dentinger)

The "Bat Boat," a crowd favourite at the powerboat festival August 9, 2015 (BlackburnNews.com photo by Dave Dentinger)

Powerboat Festival along Sarnia waterfront August 9, 2015 (BlackburnNews.com photo by Dave Dentinger)

Ethnic Greek dancing. (BlackburnNews.com photo by Dave Dentinger)