On April 2, 2026, the Natural Resource Trustees for the Nyanza Superfund Site released a Draft Supplement to the 2012 Final Restoration Plan/Environmental Assessment for public review and comment. The Draft Supplement evaluates alternatives to improve migratory (or diadramous) fish passage on the Concord River and analyzes potential environmental impacts, including those of the preferred alternative: partial removal of the Talbot Mills Dam in Billerica, Massachusetts. Public comment is now open until June 1, 2026.