Prepared by the Task Committee on Marinas 2020 of the Ports and Harbors Committee of the Coasts, Oceans, Ports, and Rivers Institute of ASCE. Planning and Design Guidelines for Small Craft Harbors, third edition, provides new, state-of-the-art guidelines for the planning, design, and development of small craft harbours. Much has changed in marina development and operation since the previous edition, and new challenges confront those charged with providing access to oceans, lakes, and rivers by recreational and commercial users. Construction and maintenance of marinas and waterfront facilities have not kept pace with demand. Products are available now that are more predictable and cost-effective. And, increasingly, available waterfront sites are often blighted or contaminated. This Manual will assist those involved with waterfront development to produce facilities that are convenient, attractive, and safe, as well as meeting aesthetic, social, and cultural goals. Topics include: planning, environmental, and financial considerations; harbour entrance, breakwater, and basin design; inner harbour structures; and land-based support facilities. Civil engineers, architects, planners, marine contractors, real estate developers, and marina owners, both public and private, will refer frequently to the guidelines presented in this manual.