A 17-year old was rushed to the hospital by air ambulance after crashing his sea-doo at Pottahawk.
It happened just after 3 p.m. on Tuesday afternoon.
Police say the 17-year old was thrown from his sea-doo and was rescued be people that were nearby.
They held the victim above water until emergency crews arrived on the scene.
The 17-year old from Oakville is listed with serious non-life threatening injuries.
The investigation is continuing.