Colorado's Blue River is 60 miles west of Denver. The Blue is a very nice freestone and tail-water fishery containing enormous rainbow trout below Dillon Reservoir. The Blue also has a good population of brown and some brook trout. Above Dillon Reservoir the river is a freestone fishery while below it is a tail-water. The Blue averages from 80-100 feet across, flowing through the Gore Mountains to its meeting with the Colorado River. Route 9 follows the Blue River providing excellent access. This photo shows the tail-water in Silverthorne, Colorado near the I-70 bridge. Thanks to Chris Erdman for scouting and sending this photo.