On September 23, 2023, staff from the cities of Chino Hills, Diamond Bar and City of Industry conducted four chaperoned tours of the Tres Hermanos Ranch (Ranch).  Participants from the general public were able to participate in the free tours after registering via the Tres Hermanos Conservation Authority (Authority) website or through direct interaction with staff from the Authority's member cities.
 
The Ranch tours originated at the Diamond Bar Center where registered participants checked in and boarded shuttles leaving hourly between 9:00 a.m. and 12:00 p.m.  Each tour participant received a commemorative bag and pin imprinted with the Authority logo along with water and snacks. 104 individuals registered for the event and 98 participated in the tour.

The tour included three stops and lasted approximately 1.5 hours. At the first stop, tour participants visited the Arnold Reservoir, where City of Industry City Manager, Joshua Nelson informed visitors of the history and the operation of the reservoir and dam.  At the second stop, tour participants visited the barn/residence where local historian Paul Spitzzeri shared the history of the people associated with the Ranch. And at the final stop, Retired Professor Dan Hostetler instructed the groups about the plants and animals located on the property. City of Chino Hills City Manager, Benjamin Montgomery and Diamond Bar City Manager, Dan Fox, chaperoned the tour, provided information about the property and the formation of the Authority, and answered general questions from tour participants.
 
Staff from the cities of Chino Hills, Diamond Bar, and City of Industry performed all of the essential support functions for the event. Support functions included: participant registration; securing shuttle contracts; preparation of the tour sites and route; supervised access to the property; participant check-in functions; assisting Docents; preparation of handouts and displays; controlling tour site area access; and performing clean-up duties after the event. Volunteers from the City of Chino Hills Citizens on Patrol program provided additional site security for the event. Authority Member cities performed these staffing services for this initial event as in-kind support with no cost recovery from the Authority. Direct costs for the Ranch Tour included: shuttle service contract - $2,199.75; commemorative bags and pins - $747.67; and food items for participants, staff and docents - $577.99. Total direct costs were $3,545.41.