The district began sending high school students to the Maple Valley Community School District in Mapleton and to Onawa in fall 1962. Castana joined the Maple Valley district along with Danbury in 1968."CASTANA JOINS MAPLE VALLEY COMMUNITY SCHOOL 1962-PRESENT." Maple Valley Community School District. March 5, 2001. Retrieved on July 16, 2018. The merged district did not use the teacher's residence and sold it in 1970. On July 1, 2012, the Maple Valley district consolidated with the Anthon–Oto Community School District to form the new Maple Valley–Anthon–Oto district."REORGANIZATION & DISSOLUTION ACTIONS SINCE 1965-66 ." Iowa Department of Education. Retrieved on July 20, 2018.
The district began sending high school students to the Maple Valley Community School District in Mapleton and to Onawa in fall 1962. Castana joined the Maple Valley district along with Danbury in 1968."CASTANA JOINS MAPLE VALLEY COMMUNITY SCHOOL 1962-PRESENT." Maple Valley Community School District. March 5, 2001. Retrieved on July 16, 2018. The merged district did not use the teacher's residence and sold it in 1970 On July 1, 2012, the Maple Valley district consolidated with the Anthon–Oto Community School District to form the new Maple Va.lley–Anthon–Oto district."REORGANIZATION & DISSOLUTION ACTIONS SINCE 1965-66 ." Iowa Department of Education. Retrieved on July 20, 2018.