Wilderness Landscape & Natural Heritage
Delvin Bog Natural Reserve is a 151-acre sphagnum bog located just outside Olympia in Thurston County, Washington. This rare wetland ecosystem is one of the few remaining intact bogs in the Puget Sound region, characterized by its thick mats of sphagnum moss, specialized plant life including carnivorous pitcher plants and sundews, and a variety of bird species inhabiting the area. Established in 1991, the reserve was created to preserve this delicate habitat, which is essential for water filtration, carbon sequestration, and ecological diversity. Visitors to Delvin Bog can enjoy walking along elevated boardwalk trails that minimize impact on the sensitive environment while allowing intimate views of the bog’s unique flora and fauna. Popular activities include birdwatching, nature photography, and educational walks guided by local naturalists during certain times of the year. The reserve is adjacent to the Black River and features a rich assemblage of wildlife, including great blue herons, red-winged blackbirds, and the occasional beaver. Because this area is especially fragile, activities such as mountain biking and fishing are not permitted. The reserve’s accessibility and peaceful setting make it a favorite location for local families and nature enthusiasts seeking a serene outdoor experience. Interpretive signage throughout the boardwalk educates visitors on bog ecology, hydrology, and conservation efforts.
