Brutal.
We had something like this a couple years ago up North in area 7 while moose hunting. A few guys parked their pickup across the road and told us the bridge was out and the the road was not passable beyond this point. We knew the road went back for dozens of KM's, with multiple spurs, basins, and camp spots. We told them in no uncertain terms that they best move their truck and allow us to pass. Eventually they did and we continued on our way, but it took a lot of arguing. The funny part is, they thought they were in the right and that we were the assholes.
They were from Mission and probably frequent this site. Bunch of losers.