The Blue River is a tailwater that flows out of Dillon Reservoir in the town of Dillon. It is known for its huge rainbows between 5 and 10 pounds. With some work, the fish can be easily spotted in the winter and early spring when they come downstream to spawn, but aren't so easily caught. They are some of the prettiest fish you will ever see, with golden bodies and bright red streaks on their sides. The river also has a good population of brown trout, with some larger ones caught in the fall. Fishing on the river can be very technical and drag free drifts are required to hook into one of these pigs. Most people either love the river or they hate it due to its technical nature. Some days you can catch fish after fish and other days you are lucky to catch one or two. The river offers a challenge for all anglers, but it can pay off with a huge fish when you least expect it.