Highest salary at Phelps in year 2010 was $58,774. Number of employees at Phelps in year 2010 was 29. Average annual salary was $32,812 and median salary was $44,341. Phelps average salary is 30 percent lower than USA average and median salary is 2 percent higher than USA median salary. From 2009 to 2010, the average salary of employees at this employer increased 4.4 percent, the median salary increased 8.7 percent.