These files consist of scanned field notebooks from long-term research and monitoring conducted in the Loch Vale watershed, Rocky Mountain National Park from June 17, 1981, through September 19, 2023. There are 72 individual PDF files. They are accompanied by a spreadsheet that serves as a pointer to the contents of each notebook, including the range of years in each, start and end dates, field observers' names or initials, and whether the field notebook includes notes on specific sample collections or research activities. There is a column noting whether and when there was field equipment maintenance, whether the notebooks include sample sites outside Loch Vale watershed (and where), and names of the notebook scanners, proofreaders, and quality assurance evaluators. A map of the locations of all sample sites within Loch Vale and additional long-term sites in Rocky Mountain National Park is included with the field notebook files. This file is titled "AllSitesMap_fieldnotebooksdatarelease.pdf".