1880 Congregation of Zion/St. Paul’s Lutheran (formed in 1864) built a new church at the n.e. corner of Wood & Monroe, which weekdays served as a school – Kruetz School. The building was later moved to the s.e. corner of Prairie & Jackson St. for use as a school (where the public bus transit is now).
1888 Formation of a mission school at the southwest corner of Lowber & Orchard streets for people living in the northeast part of the city– cost to attend was 25 cents/pupil/month. 24’ x 40’ school building. Name – “Kruetz-Schule und Mission Verin” (German).
St. John’s
1891 St. John’s established their congregation. The school at Lowber & Orchard became known as St. Johannes (John’s) Lutheran School.
1911 Addition to school at Lowber & Orchard.
1954 Education building added to St. John’s church, located on Orchard St.
St. Paul’s
1904 A new brick school house was built on the site at Prairie & Jackson. St. Paul’s Lutheran School and was utilized until 1929 as a school.
1929 St. Paul’s Lutheran Church built a new Parish Hall at Main & Edward, which included a school.
1950 New parish hall and school building at St. Paul’s (Main & Edward).
1959 Lutheran School Association (LSA) formed by 6 Missouri Synod Lutheran Churches in Decatur – St. John’s, St. Paul’s, Trinity, Our Redeemer, Concordia, Mt. Calvary original members. Grades K-4 were at the St. John’s location, 5-8 were at the St. Paul’s location.
1998 LSA combined their two buildings and moved to Kemper Insurance Building on Mound Road.
2000 LSA High School was formed.
2004 State of the art gymnasium added.
2011-2014 Baseball fields excavated. Baseball field completed.

Today, all but Our Redeemer Lutheran Church remain members in the Association. This year is the second year in a row that LSA High School has had a freshman class of over 40 students.