Green Mountain Reservoir anchors the lower Blue River and its fall kokanee run

In the quieter northern end of Summit County, the Blue River widens into Green Mountain Reservoir. It is a federal reservoir, built and operated by the Bureau of Reclamation as part of a large water project, and the water level can swing a lot through the season as releases change.

The reservoir is a draw for boating and fishing, and it is the source of one of the area’s more interesting events. Each fall, kokanee salmon turn red and migrate up the Blue River from the reservoir to spawn. Colorado allows snagging for kokanee, but only during a set season and with its own limits, separate from regular trout fishing.

Why a newcomer should care: the changing water level affects ramps and shoreline, and the kokanee rules are specific and seasonal, not the same as everyday fishing. Knowing the season and limits keeps you legal and makes the trip worthwhile.

Before fishing or snagging at Green Mountain Reservoir or the lower Blue River, check Colorado Parks and Wildlife for the current kokanee season and limits.