Welcome to Our Lady of the Lake. We are committed to providing a premier experience for our patients and guests. Our Lady of the Lake Regional Medical Center Main Campus 5000 Hennessy Boulevard Baton Rouge, LA 70810 (225) 765-6565 Livingston Campus 5000 O'Donovan Boulevard Walker, LA 70785 (225) 271-6000. Assumption Community Hospital 135 Louisiana 402 Napoleonville, LA 70390 (888) 765-2110 ....