Chamna Natural Preserve

Chamna Natural Preserve is a 276-acre protected natural area located within the city limits of Richland, Washington. Established in 2004, the preserve protects a significant remnant of native shrub-steppe and riparian ecosystems along the Yakima River in the Columbia Basin. Managed by the City of Richland Parks and Recreation Department, it serves as an important urban refuge for wildlife and a site for environmental education and low-impact recreation.

Description and location

Chamna Natural Preserve is situated on the northern bank of the Yakima River, directly adjacent to the Interstate 182 bridge connecting Richland, Washington and Pasco, Washington. The preserve lies within the Columbia River Plateau ecoregion, characterized by its arid climate and deep Missoula Floods-scoured landscapes. Topographically, the area includes riverfront riparian zones, gently rolling uplands, and steep basalt cliffs, providing diverse habitats within a relatively compact area. Its location within the Tri-Cities, Washington metropolitan area makes it a uniquely accessible natural space for residents of Benton County, Washington and Franklin County, Washington.

Flora and fauna

The preserve is a biodiversity hotspot, supporting a mosaic of plant communities representative of the imperiled shrub-steppe ecosystem. Dominant vegetation includes big sagebrush, bluebunch wheatgrass, and Sandberg bluegrass, alongside showy spring wildflowers like yellow bells and balsamroot. The riparian corridors are lined with black cottonwood, water birch, and willow species. This habitat diversity supports a wide array of fauna, including over 130 species of birds such as great horned owl, white-crowned sparrow, and yellow warbler. Mammals like coyote, mule deer, and the elusive badger are present, while reptiles including the northern Pacific rattlesnake and western fence lizard inhabit the drier slopes. The Yakima River itself provides habitat for chinook salmon and steelhead.

History and management

The land comprising Chamna Natural Preserve has a long human history, with the Confederated Tribes of the Umatilla Indian Reservation and Yakama Nation having ancestral ties to the region. In the 20th century, portions of the area were used for gravel mining and agriculture. The preserve was formally established in 2004 through a collaborative effort involving the City of Richland, Washington, the Washington State Department of Ecology, and funding from the state’s Centennial Clean Water Fund. Management is guided by a natural resources management plan focused on restoring native habitats, controlling invasive species like cheatgrass and Russian olive, and mitigating human-wildlife conflicts. Scientific research and monitoring are conducted in partnership with organizations like the Washington Department of Fish and Wildlife.

Recreation and access

Chamna Natural Preserve offers approximately 11 miles of multi-use trails for non-motorized recreation, including hiking, trail running, birdwatching, and mountain biking. Primary access is via a parking area on the north side of Interstate 182, with a pedestrian tunnel providing safe passage beneath the highway to the main preserve. Key trails include the Riverfront Trail, which offers views of the Yakima River and Cable Bridge, and the upland loops that traverse sagebrush habitats. The preserve is a popular site for community events like the Chamna Sagebrush Stomp and serves as an outdoor classroom for local schools and groups such as the Tri-Cities Natural History Society. Interpretive signage educates visitors on the area's ecology and conservation.

Conservation and threats

As a protected area within a growing urban region, Chamna Natural Preserve faces ongoing conservation challenges. Primary threats include the encroachment of invasive plant species, habitat fragmentation, and pressures from adjacent land uses. Conservation efforts are focused on active restoration, including native plant revegetation projects and the careful management of water resources. The preserve’s health is intrinsically linked to the Yakima River basin, facing broader issues like climate change impacts on river flow and temperature. Its continued protection is considered vital for preserving regional biodiversity, serving as a core habitat area within the Washington Wildlife Habitat Connectivity Working Group's planning, and providing ecosystem services to the Tri-Cities, Washington community.

Category:Protected areas of Benton County, Washington Category:Parks in Washington (state) Category:Richland, Washington