The site of what became Trione-Annadel was being eyed for residential development when Henry Trione and hunting buddy Joe Long of Long's Drugs put together a $5 million package that led ultimately to the site's protection as a park. Trione built his home on the hillside adjacent to Annadel. In 2012, he pitched in another $100,000 to keep the park running under county administration at a time when Annadel and dozens of other parks statewide were threatened with closure because of a budget crisis. It was due to these philanthropic efforts that the State of California ruled in July 2016 to officially change the name to Trione-Annadel State Park.