TreeFlow is a comprehensive web resource on tree-ring reconstructions of streamflow and climate (temperature) for the United States. The site provides access to data for over 70 streamflow reconstructions as well as information on data development and applications. While the primary users of streamflow reconstructions are water resource professionals, people in several other sectors and disciplines may find the data useful. Users can acquire data and graphics to place historic variability and projected change in streamflows in a long-term paleo context.

TreeFlow is intended as a dynamic resource for the dendrochronology and water managment communities. The site can be expanded as reconstructions are generated for other basins, and as new applications are developed. The site also encourages contributions from researchers and water providers. In the future, the site also intends to include additional hydrologic reconstruction resources that are currently under development. These include a network of Rocky Mountain snowpack reconstructions and North American monsoon reconstructions.

TreeFlow is a collaborative effort of researchers affiliated with two NOAA-funded Regional Integrated Sciences and Assessment (RISA) programs: Climate Assessment for the Southwest (CLIMAS) at the University of Arizona, and Western Water Assessment (WWA) at the University of Colorado. The TreeFlow website is housed on a server at the University of Arizona.