4. Why depth is important. (4 of 21)
Getting the right depth is also important. Most times, trouts stay close to the bottom of a river, where the current is slower and it's easier for them to hold their position. They may ignore something drifting more than a few feet above them. During aquatic insect catches though, when there are insects throughout the water column, trout may range from their spot on the bottom to grab something in mid-water.
But when they're not actively feeding, you'll do your best shoving your flies in their face.