Birch Bay State Park is a Washington state park located south of Blaine in Whatcom County, within the town of Birch Bay. The park has of saltwater shoreline on Birch Bay and of freshwater shoreline along Terrell Creek. Recreational opportunities include camping, picnicking, fishing, hiking, crabbing, clamming, and boating.
An archeological site, 45-WH-9, or as it was called by the native peoples of the area, , is located within Birch Bay State Park. It is one of the largest sites in the area, and despite having been recorded since 1963, little archeological work has been done. Most work was done in 1975 and 1976, finding large amounts of Canis Lupus Familiaris bones.