The park contains a historic wooden spring box that provided Olympia's municipal water supply from the early 1900s until the 1950s.
The forest canopy is primarily composed of second-growth timber that reclaimed the land after industrial logging operations in the early 20th century.
The park's ravine system is formed by the erosion of glacial outwash deposits, creating the steep topographical profile.
The site acts as an aquifer recharge area, contributing to the groundwater quality of the McAllister wellfield.
Watershed Park is a 153-acre urban forest in Olympia that protects the historic McAllister Creek watershed. The park features a dense, second-growth coniferous forest dominated by Douglas fir, western red cedar, and western hemlock. An extensive trail system winds through deep ravines, with the primary route leading to a historic wooden spring box structure. The terrain is notably steep, requiring visitors to navigate significant elevation changes within the ravine. The park serves as a primary recharge zone for the city's municipal water supply. Lush understory vegetation, including sword ferns and salal, characterizes the forest floor. The area functions as a vital wildlife corridor for birds, amphibians, and small mammals within the urban landscape.
The wooden bridge and viewing platform near the historic spring box site.
Wear sturdy, waterproof hiking boots with good traction due to the steep, muddy slopes.
Use trekking poles if you have concerns about stability on the uneven, rooted, or slippery ravine paths.
Download an offline map, as cell service can be intermittent within the deep ravines.
Attempting the steep ravine trails immediately following heavy rainfall, as the clay-heavy soil becomes extremely slippery.
Dogs must be kept on a leash at all times to protect the local watershed and wildlife.
