Los Angeles County Public Works director Thomas A. Tidemanson will retire in March after more than 38 years of county service, a spokeswoman confirmed Wednesday.
Tidemanson, who has served as director of the Department of Public Works since 1985, previously was the county's road commissioner. He could not be reached for comment Wednesday.
Tidemanson, who earns $157,586 a year, oversees a department of more than 3,800 employees and a budget of $700 million. The department is responsible for roads and flood control, water conservation and sewer systems in 4,000 square miles of unincorporated areas, and administers five airports.
Spokeswoman Donna Guyovich said Tidemanson's resignation will become effective March 2.