40 Acres of Marymoor Park are designated as an off-leash area. Dogs have ample access to the Sammamish River. SODA, an all volunteer organization, maintains the off-leash area with little support from King County. On a typical weekend, a couple thousand dogs will visit the off-leash area. Three Goldens Swimming View of River Golden Swimming Towards Other Golden Diving for ball on bottom Two Black Labs in Water Peanut Swimming Among the Trees Retrieve Ball From Bottom of Stream Peanut with Face in Water