The Snoqualmie River Lake Crescent site is on property owned and managed by the Washington Department of Fish and Wildlife. Enhancement Actions. Snohomish County staff and Washington Conservation Corps staff enhanced the riparian forest along the entire shoreline of the WDFW property. Restoration actions included invasive species removal and conifer augmentation in the narrow band of vegetation along the river and expansion of the riparian area through planting of mixed conifer and deciduous stock. Enhancement actions removed and controlled invasive understory plant species and replanted with trees (Sitka spruce (Picea sitchensis), Douglas fir (Pseudotsuga menziesii), western redcedar (Thuja plicata), grand fir (Abies grandis), red alder (Alnus rubra) and big-leaf maple (Acer macrophyllum)) and shrubs (Scouler willow (Salix scouleriana), red-osier dogwood (Cornus sericea), thimbleberry (Rubus parviflorus), Pacific ninebark (Physocarpus capitatus), twinberry (Lonicera involucrata) and snowberry (Symphoricarpus albus)).