The average aide salary at Garrison Elem. was $29,734 , which is 29 percent higher than the average salary for this job in Missouri, but 8 percent lower than the national average for this job . Aide salaries at Garrison Elem. typically range from $17,644 to $46,297 (25th to 75th percentile). The highest reported aide salary was $51,472. There are 6 employees at Garrison Elem. with the job title aide.