The New Milford Historical Society & Museum will hold its next lecture program, “Candlewood Lake and its Impact on New Milford” on Sept. 20.

Larry Marsicano, executive director of the Candlewood Lake Authority, will lead the 2 p.m. slide show and program at the museum, 6 Aspetuck Ave.

The program will serve as the opening for the museum’s new exhibit, “The Creation of Candlewood Lake and Its Impact on New Milford,” offered in the New Milford Gallery.

Marsicano will discuss some of the lake’s history and the origins and need for the Candlewood Lake Authority, highlight some of the environmental issues confronting life at Candlewood Lake and its environs.

Since 1926, several environmental issues have arisen to challenge the life and health of the lake and its residents.

The response to these challenges will also be covered in the presentation.

The creation of Candlewood Lake in the 1920s for the purposes of hydroelectric power generation was a regionally historic event and one that continues to impact the state and the surrounding five towns, including New Milford and Sherman.

Nearly 90 years after its creation, Candlewood Lake has become an important natural resource providing untold environmental, recreational and local quality of life values.

The lake has also become an economic engine generating millions of dollars in property taxes and promoting a wide range of commerce.

Despite its importance, Candlewood Lake confronts a number of environmental challenges, including eutrophication and the introduction of invasive aquatic species.