MADISON, WIS. — Mead & Hunt Inc. and RPM Engineers have merged, now operating as one entity under the Mead & Hunt name.

Collectively, the firm now employs more than 500 civil, structural, mechanical, and electrical engineers, planners, historic preservationists, environmental scientists, architects, technicians, and support specialists from 22 offices located in 13 states.

RPM Engineers consulting engineering firm has locations in Lexington and Myrtle Beach, S.C.; Charleston, W.Va.; Dublin, Ohio; and Richmond, Va. RPM specializes in bridge design, analysis, rehabilitation, roadway design, construction engineering, inventory inspections, inspection, and material testing services.

Mead & Hunt provides professional services in architecture, historic preservation, transportation, aviation, infrastructure, and water resources engineering to clients throughout the United States.

The corporation said it remains strong on Engineering News Record's (ENR) Top 500 design firm list with a current national ranking of 171.