This park features the duplex home of Timothy and Michael Riordan, lumber baron brothers who married sisters, Caroline and Elizabeth Metz.

Cooperatively the Riordan brothers built their thirteen thousand square foot mansion in 1904 while Arizona was still a territory.

The home consisted of two similar six thousand square foot wings for each family, connected by a large common room.

This was the results of cooperative efforts of the family owner, Robert Chambers, who had died in 1980, and the Arizona State Park board members and personnel.

The Riordan Action Network Group, a team of local volunteers fund-raises to keep the park open and pay the staff salaries.