Round Rocks Fly shop reports that the Logan is a little off color making fishing a little easier. Here's a look at current water levels for many Utah waterbodies, including the Logan River. Round Rocks Fly shop reports that the Logan is a little off-color, making fishing a little easier. Try using larger nymphs and streamers where the water is dark. As water clarity decreases because of run-off, try using larger flies such as brightly colored San Juan Worms; they are easier for fish to see.