Paleohydrologic information collected from tree rings have become valuable tools for drought planning and water resources management. The goal of this project is to expand that usefulness to a broader range of water providers and resource managers. This goal will be accomplished using a two-pronged approach that includes: 1) TreeFlow, an updated and comprehensive Web-based resource for data, applications, and analysis that addresses regional needs and interests and can be expanded to include additional regions of interest and reconstructions that are generated in the future, and 2) the development of a Web-based paleo toolkit to facilitate applications and use of streamflow reconstructions.