The Penobscot River Restoration Project (PRRP) sought to restore self-sustaining populations of sea-run fish through strategic dam removal, improved fish passage, and rebalancing hydropower in the Penobscot River, Maine. The PRRP culminated with the removal of two lower river mainstem dams in 2012 (Great Works) and 2013 (Veazie) and the decommissioning and bypassing of a third in 2016 (Howland). The PRRP offered an opportunity to collect data on the long-term ecological responses of large-scale dam removal through monitoring that occurred before, during and after dam removals. A suite of nine field studies were undertaken and all pre-dam removal data and summary reports have been archived and made publically available. The monitoring program is planned to continue through 2027 and post-dam removal data will also documented and archived. These data will provide restoration planners, scientists, and managers with information for evaluating project outcomes and may assist with identifying realistic expectations for future dam removal opportunities. For more information contact Tim Sheehan.