November 6, 2001. 86% of Ames voters supported the Hallet's Quarry Bond Issue.
January 8, 2002. The City of Ames took ownership of Hallett’s Quarry.
July 2004. Ada Hayden Heritage Park park was opened to the general public.
September 16, 2006. Mecine Wheel is Dedicated.
Hallett's Materials - Ames Historical Society
Friends of Hallett's Quarry
FoHQ - Ames Historical Society
FoHQ Position Paper
Ada Hayden Heritage Park
Bond Issue Referendum
Ada Hayden Heritage Park, a Mid-Iowa gem, Ames Tribune, Dennis Keeney, Dec. 17, 2010