1926
Fr. J.B. Culeman voices need for a central high school.

1931
Msgr. Durkin purchases six acres from W.L. Velie estate for $6,500.

1931 - 45
The Depression followed by wartime and post-war labor and material shortages delayed building of the school.

1945
Building Fund Campaign begins.

1947
Msgr. Durkin picks the name "Alleman" in honor of Rev. John George Alleman, O.P., a native of Alsace Lorraine.

1948
Archbishop Schlarman blesses and places cornerstone on August 15.

1949
Amieto Cardinal Cicognani, Apostolic Delegate to the United States, dedicates the school. Alleman opens its doors on September 12, 1949. Enrollment was 571. The faculty included 9 BVM Sisters of Charity, 4 Franciscans, 4 Priests, 7 Benedictines, 2 Dominicans and 4 lay personnel.

1953
Viatorian priests join staff.

1957
Add 8 classrooms and counseling offices. Booster Club erects Athletic Building. Capacity up to 1,200 students. Parking lot extended.

1963 - 65
South Wing added, which includes 14 rooms and 2 study halls.

1966
Mosaic added to west wall of newest wing. It was created by sister Mary Alexia, OSB, and project advisor, Father George Wuellner.

1967
Residence (27 rooms) and Chapel added. Viatorians assume responsibility for operation and administration of Alleman. Diocese retains ownership of Alleman.

1973
Faculty Advisory Council created.

1978
Capital Endowment Drive, "A Design for Tomorrow," begins.

1979
Casey Gym added.

1992 - 97
"In Pursuit of Excellence," first combined-capital-campaign drive for all five Illinois Quad-Cities Catholic Schools: Alleman, Jordan, Seton, St. Anne and St. Mary's.

1998
Father Alleman roses transported from St. Joseph's Church in Fort Madison, Iowa, and St. James Church in St. Paul, Iowa, to Alleman High School. 50th Anniversary of Alleman. Theme: "A strong Past - A Promising Future."

1999
Gym lobby is expanded to include a commons addition. The house located just south of the student parking lot is purchased and torn down in order to expand the parking lot to 152 spaces.

2000
In August, Alleman announces the acquisition of 25 acres, located off John Deere Road, for the construction of athletic fields. In September, the lower 17 acres of the Alleman Athletic Complex, located at 1001 52nd Ave., Moline, Illinois, are developed to include two baseball diamonds, two softball diamonds, a soccer field and a practice-football field. In September, the Dr. Tracy Spaeth Performing Arts Center Opens. The 620-seat facility also includes a basement athletic facility. In November, the Alleman Athletic Building ("The Barn") is torn down and the football field is expanded to regulation size.

2001
Alleman Athletic Complex officially dedicated.

2010
Main Office renovated to include a convenient outside entrance and parking.

2011
Chapel renovated and named Fr. Mirabelli Chapel in honor of his extraordinary service to the high school.

2012
Cafeteria remodeled with new ceiling, lighting and flooring. New vestibule entrance added outside the chapel entrance.

2015
Don Morris Gymnasium remodeled with new bleachers, lights, baskets, scoreboards and athletic banners. Also, sound system upgrade, floor refinishing and painting of ceiling and upper bleachers.

Congratulations to Fr. Mirabelli on the 60th Anniversary of his ordination to the priesthood!