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Vegetation Resources

Old growth
Stand of mature/growth conifer forest near I-90

Vegetation Restoration Concepts

Chapter 810 of the Roadside Manual (pdf, 510mb)
Chapter 810 of the Roadside Manual contains guidelines that provide the background for the development of effective vegetation restoration methodologies. Two basic restoration approaches are used: managed succession and accelerated climax community development. They are based on the principles of plant succession in natural ecosystems.

Map of Washington State Eco-regions
It is the policy of WSDOT to use native plants. This map is an aid in determining what is considered native, and may be used to help in specifying and obtaining plant materials.

Eco-regions denote areas within which ecosystems (the type, quality, and quantity of environmental conditions) are generally similar. The approach used to compile this map is based on the premise that ecological regions can be identified through the analysis of the patterns and the composition of biotic and abiotic phenomena that affect or reflect differences in ecosystem quality and integrity (Wiken 1986; Omernik 1987, 1995). These phenomena include geology, physiography, vegetation, climate, soils, land use, wildlife, and hydrology. The relative importance of each characteristic varies from one ecological region to another regardless of the hierarchical level.
The map of Washington State Ecoregions is derived from Omernik, J.M. 1987. Ecoregions of the conterminous United States Map (scale 1:7,500,000). Annals of the Association of American Geographers 77(1):118-125.

Vegetation Alteration
Neighbors and businesses adjacent to WSDOT right-of-way often request to alter, remove, or even plant trees, shrubs, and plants on WSDOT property. WSDOT works with others to plant on our property; however, WSDOT policies do not support requests for removal or alteration of vegetation. There may be rare exceptions that vegetation alteration may be allowed if it is mutually beneficial to the goals of the transportation facility. The following documents list the policies and procedures to evaluate these requests.
FHWA Memos (pdf, 282kb)

Fire Effects Information
The Oregon Association of Nursery and Nurserymen Directory and Buyers Guide
Plants for Saline to Sodic Soil Conditions
Reading Seed Packaging Labels and Calculating Seed Mixtures
Trees of the Pacific Northwest
USDA, Natural Resources Conservation Service, Plants Database
Washington Native Plant Society
Washington State University Cooperative Extension; Gardening in Western Washington, Native Plants
Western Wetland Plants

Washington State University, Hortsense
Wildlife Invasive Species Team

Washington Forecast Discussions
Wise Water Use (pdf, 40kb)

Juli Hartwig, PLA
Roadside and Site Development Manager
Phone: (360) 705-7242