Catherine Gerrish , MD Internal Medicine Dr. Catherine Gerrish completed medical school at the University of South Dakota School of Medicine in Vermillion. She fulfilled her internship at Creighton University in Omaha, Nebraska. Her residency was completed at University Hospitals Case Western Reserve in Cleveland, Ohio. Dr. Gerrish is Board Certified by the American Board of Internal Medicine. Brown Clinic, P.L.L.P. 506 First Avenue Southeast Watertown, South Dakota 57201 (605) 886-8041 or 1-888-886-8482 « back to directory P:605.882.7000 | 877.917.PLHS (7547) | info@prairielakes.com 401 9th Ave. NW Watertown, SD 57201 Privacy Policy