Cavers is a small town on Highway 17 about 50 minutes east of Nipigon. While I remember passing a sign that said Cavers, I don’t really remember much. I assume the town is slightly south of the Transcanada.
The Gravel River Provincial Nature Reserve is just a bit west of town on the shore of Lake Superior. Unless you need gas immediately, I’d wait until Schreiber to get off Highway 17.
If you have any information or any photos, please send them my way. My email is info (at) highway11 (dot) ca.