The Three Forks Natural Area has more than 200 acres of open space situated at the confluence of the south fork, north fork and middle fork of the Snoqualmie River. With an astounding up-close view of Mount Si, it is dominated by riverine, riparian, and wetland habitat. 

Adjacent to the natural area is the Three Forks Off-Leash Dog Park, which has eight acreas of mowed open space for running large and small dogs. The park is partially fenced and has water access.