Lake King William is located close to Dewent Bridge, which is located on the Lyell Highway at the southern edge of the Cradle Mountain Lake St Clair National Park. It is just south of Lake St Clair and the Lake St Clair visitor centre; and it is north of Lake King William and the Butlers Gorge power station.

It is also the last inhabited location before Linda Valley in the West Coast Range; this section of the highway passes through the Wild Rivers National Park where you will find the Gordon River and Franklin River.

In the past there were a couple of isolated houses along Lyell Highway that have been removed. Today, Derwent Bridge features not only the bridge mentioned in its name but accommodation units, and also a roadside public house.