Transportation infrastructure depends on a thorough understanding of water, sediment, and environmental processes to ensure the safety, resilience, and long-term performance of roads, bridges, railways, airports, ports, and transit systems. NHC partners with transportation agencies, municipalities, rail operators, and engineering consultants to address complex hydraulic, hydrologic, coastal, and geotechnical challenges affecting transportation assets. From bridge hydraulics and scour assessments to flood risk management, river engineering, shoreline protection, and climate adaptation, our multidisciplinary teams deliver practical, science-based solutions that help clients improve infrastructure resilience and protect critical transportation networks.