Heffron Transportation led the transportation planning and analysis for the Port of Seattle's North Bay Master Plan and EIS. This project proposed to redevelop about 53 acres of uplands at Terminal 91 in the Interbay area of Seattle. Key issues addressed by the master plan included developing the site's internal roadway network, establishing design standards for different types of on-site streets—including those that would to serve trucks destined to industrial businesses—and determining the phasing for major infrastructure investments. The EIS evaluated the transportation and parking impacts of five development alternatives. Off-site analysis was performed for 22 intersections.