UPDATE: OPP reports all lanes now open.

Bracebridge OPP is still on the scene of a serious collision that has sent a woman to hospital with life-threatening injuries.

Police say the 30-year-old woman was walking southbound on Highway 11 shortly before 5:00 a.m. Thursday morning when she was struck near Sparrow Lake Road D in the Town of Gravenhurst.

After police and EMS arrived, she was then transported to a Toronto area trauma centre.

The vehicle involved failed to remain at the scene.

The southbound lanes of Highway 11 will remain closed for several hours while the OPP  gathers evidence and reconstructs the scene.

The Bracebridge OPP are looking for people who may have witnessed this collision and may be able to identify the vehicle involved.

If you have any information on this crash, police ask you to contact the Bracebridge Detachment at 705-645-2211 or Crime Stoppers at 800-222-8477.