The third Quincy Senior High opened at 30th and Maine in 1957. The first high school building at 12th and Maine was torn down in June of 1967. Enrollment continued to climb steadily in the Quincy schools and another building was needed. It was decided to construct an additional high school to the east of the existing high school (the site of the former Gem City Drive In). The fourth and current high school building opened in the fall of 1972. At the time of its opening, it was named Quincy Senior High II and housed students in grades 11 and 12. The existing high school at 30th and Maine was renamed Quincy Senior High I, and converted to grades 9 and 10. The junior high would include just 7th and 8th graders. In the 1980s, the district experienced several finance problems and an enrollment decline. As a result, the entire district was reorganized. Senior High I closed in 1982. Tenth grade was moved to Senior High II and ninth grade was moved back to Quincy Junior High. Senior High I was converted into Baldwin Intermediate School for grades 4–6.