The National Park Service (NPS) Vegetation Inventory Program (VIP) is an effort to classify, describe, and map existing vegetation of national park units as part of generating baseline data products for the NPS Natural Resources Inventory and Monitoring Program. A vegetation map of the Lewis and Clark National Historic Park (LEWI) was developed as part of a cooperative project between the National Park Service (NPS) and the Institute for Natural Resources' Oregon Biodiversity Information Center (ORBIC). The project complemented ongoing species-level inventory at the park which took place during 2009 and 2010.