David Evans and Associates is a professional services firm that provides engineering, planning, and consulting services to clients in the transportation, water resources, and land development markets. The company was founded in 1976 and is headquartered in Portland, Oregon. David Evans and Associates has more than 20 offices throughout the United States and employs over 1,000 people. The company's services include transportation planning and design, water resources engineering, land development planning and design, and environmental planning and permitting.