The park preserves a variety of ecosystems from coastal dunes, estuarine mudflats and tidal marshes to shrub wetlands, temperate rainforests and swamps. Situated within the Sitka spruce vegetation zone, its forests are dominated by conifer trees and carpeted with a great diversity of understory shrubs, ferns and wildflowers. Giant Sitka spruce more than 100 years old and up to 36 feet in circumference can be found here. Extensive wetlands in the park include fringing salt marshes on the lower Columbia River, the tidally-influenced lower Lewis and Clark River and many low-gradient brackish sloughs and marshes. Freshwater streams and springs are numerous in park forests, and freshwater ponds are found in various habitats. These wetlands provide valuable habitat for a diversity of mammals, birds, reptiles, amphibians and fish.
The park's strategic geographic location and varied habitats are largely responsible for its high fauna diversity of more than 140 species
More than 250 species of vascular plants and 74 of mosses and liverworts have been documented at Lewis and Clark NHP
Long Term Monitoring
Natural resources park rangers participate in long term monitoring of water, weather, plants and wildlife at the park.
Natural Features & Ecosystems
The park's habitat diversity ranges from coastal rainforest to riparian and estuarine marsh, shrub, and swamp wetlands.
Last updated: April 1, 2021