Great Lakes Bay Surgery & Endoscopy Center is Midland's only freestanding outpatient surgery and endoscopy center in Midland. We are located at 4228 Bay City Road in Midland, Michigan. The same highly skilled physicians that perform surgeries at area hospitals and medical centers perform surgeries at the Great Lakes Bay Surgery & Endoscopy Center.About Us‧Employment Opportunities‧COVID-19 Safety‧Our Physicians‧Medical Specialties/Procedures List‧Directions.