Try fishing the lower Nitinat when the salmon are in. Bears to the left, bears to the right. Four in sight at one time is not uncommon. Mostly the bears and people are wary of each other but don't panic. A bear closer than about 10 yards is cause to take action.
A buddy was working a fish into the shallows when a bear rushed past him from behind, grabbed the fish and took off up river. This was watched by several people who split a gut laughing at his surprise.
On a serious note, I have had some bears get just too pushy and had to use a bear banger but over there they have heard the bangers so often they don't go far. Woof and around a bush to return in about 20 seconds.