Highest salary at Bethalto Sd 8 in year 2018 was $132,835. Number of employees at Bethalto Sd 8 in year 2018 was 172. Average annual salary was $21,431 and median salary was $18,904. Bethalto Sd 8 average salary is 54 percent lower than USA average and median salary is 57 percent lower than USA median salary.