Highest salary at Phelps in year 2014 was $80,973. Number of employees at Phelps in year 2014 was 32. Average annual salary was $34,718 and median salary was $39,677. Phelps average salary is 26 percent lower than USA average and median salary is 9 percent lower than USA median salary. From 2013 to 2014, the average salary of employees at this employer increased 8.9 percent, the median salary increased 3.8 percent.