No photographer given. Chilko Lake is the area where the Coast Range gives way to the interior plateau. It is not easily reached: I visited there several times in the 1970s.
The road from Williams Lake (Highway 20) to Bella Coola (on the coast) was not paved at all at that time. It is paved now, so I have heard, but Chilko Lake requires driving on even more remote (and bad) roads. But the scenery is spectacular.
Unfortunately all my (many) photos are on film.
Highway 20 is even not shown on Google Maps. The largest town shown below is Kamloops.