Broken Mammoth, Alaska is an archeological site located in the Tanana River Valley, Alaska, in the United States. The site was occupied approximately 11,000 to 12,000 years ago (10,000 - 9,000 BC) making this one of the oldest known sites in Alaska. Charles E. Holmes discovered the site in 1989 and investigation of the site began in 1990 and excavations are ongoing to this day.