Coquille Myrtle Grove State Natural Site is a state park administered by the Oregon Parks and Recreation Department in the U.S. state of Oregon. The park, bordering the Powers Highway (Oregon Route 542) between Myrtle Point and Powers, in Coos County, features a swimming hole and sandy beach along the South Fork Coquille River. Other amenities include parking, picnic tables, restrooms, and access to fishing but no drinking water.