Ph.D. students and graduate historic preservation and architecture students updated a 1988 Historic Structures Survey of Rocky Mountain National Park. Students conducted a selective survey of properties that were undocumented and were assumed to be at least fifty years old and developed field determinations of eligibility for the National Register of Historic Places. During the study, 45 properties, built from the late 1920s through the 1950s, and located in thirteen discrete areas were evaluated by students. The descriptive, historic, eligibility, and condition information was utilized by Rocky Mountain National Park to update its Historic Building Five-year Treatment Plan and the National Park Service's List of Classified Structures.