It's pretty vast. On the Fraser main stem, when I fish, it doesn't take long before they accompany me to my net. Then, they're harvesting on their own. Whenever we get opportunities, they are front and centre. They are very smart animals. They know the sound of boats and they know what you're doing, so it doesn't take long for them to be attracted to both the sound and the fishery.
In terms of tributaries, from my territory, where I am in the Sumas-Vedder-Chilliwack region.... The Vedder-Chilliwack system has plenty of pinnipeds, but also the Sumas River and Marshall Creek. Marshall Creek is a small creek that is only about a foot and a half deep—maybe two feet at the best of times—and maybe six feet wide. I've witnessed pinnipeds in that system.
They are anywhere and everywhere there is a food source.