The St. Vrain Corridor Committee was formed in 1992 to address issues relating to stream flow in the North St. Vrain River. The Committee has representatives from Boulder County, Lyons, Longmont, Colorado Division of Wildlife, Colorado Water Conservation Board, Colorado Forest Service, Trout Unlimited and the District. The current leading issue of concern is increasing winter stream flow in the North St. Vrain between Button Rock Dam and Lyons to support recreation, fishing and tourism.
Trout are a native species in St. Vrain Creek in the reach between Lyons and Longmont, where the mountain creek makes its transition to a plains stream. A critical limiting factor for trout habitat in this reach is low winter streamflow. Ditch companies with headgates in this reach have water rights for storage that allow them to divert creek water during the winter to fill reservoirs. During periods of cold and dry weather when stream flow is diminished, these diversions for storage may dry up the creek just below their points of diversion, resulting in a streambed with stagnant pools and no flow.