What is the salary range of a Diesel Mechanic III?
As of August 01, 2025, the average annual salary for a Diesel Mechanic III in Polk City, IA ranges from $56,302 (25th percentile) to $67,103 (75th percentile), with a median annual salary of $62,037 and an hourly rate of $30. A Diesel Mechanic III's salary is shaped by several key factors, including experience level, specific skills, industry differences, company size, and more. Below, we'll explore how each of these influences compensation.