The format is very different this year and designed to be more accessible. It’s an OpenDocument Spreadsheet which is usable across different platforms. The filtering options allow anyone to focus on rivers of interest, and the data can be downloaded for your own particular use. Freshet dates are on the “Release_Frequency” tab.
Thanks very much to Johnathan Riddell of the Scottish WW Guide / Andy Jackson Fund for Access for the calendar view of releases.