TRB Conference Proceedings on the Web 1 -- Environmental Spatial Information Transportation: A Peer Exchange on Partnerships summarizes a June 23-24, 2003, workshop held in Woods Hole, Massachusetts. The workshop was designed to document lessons learned by early adopters of innovative environmental data-sharing practices. In addition to a summary of state team presentations and discussions on development of environmental databases, the report includes a short list of workshop follow-on activities and responses to questions designed to help summarize important dimensions of data-sharing.