The Blue River can be found winding its way through Summit County, CO and is possibly one of the most beautiful Colorado Fly Fishing spots. This river starts up on Hoosier Pass, flowing north through Breckenridge and Silverthorne on its way to its confluence with the Colorado River. During its trek north, the Blue fills two reservoirs and features many different fishing environments. The Blue River is not a big river, with most sections of it shallow enough for wading. With the close proximity to Lake Dillon, which provides a large percentage of water to the Front Range, the Blue typically sees very low flows. When the river actually rises to reasonable flows (200 to 1200 CFS), the river peaks for fishing. The Blue River is very clear and cold year-round, however, it doesn’t typically freeze in the winter.