Low Water and Herons Hammering Trout

They stocked a local trout stream here last week. The stream is low, very low for late winter. Anyway I watched a heron catch a trout last week. It downed a pretty big one. Yesterday I walked along this stream and there were 3 herons at the same spot. I can only imagine how many trout they will eat before the season starts. Last year I was fishing this stream and a heron would walk right up next to you as you caught trout on your fishing rod. The splashing fish on your line would bring this heron right in. I would scare it away but I was shocked how brazen it was. They used to be very shy and elusive.