Established in 1974, the school had approximately 136 students in grades 9–12 and 109 students in grades 6–8 during the 2009–10 school year.

[4] They have Varsity and Junior Varsity baseball, softball, basketball, volleyball, cheerleading, as well as track, golf and soccer teams, called the Sunapee Lakers.

[5] SMHS has an unfunded, but comprehensive drama program, producing plays such Footloose, Godspell and Alice in Wonderland.

[6] Some of the clubs and groups within the school are the Art Club, French Club, Harvard Model Congress, National Honors Society, Mock trial, Chess Club, Writers' group, Athletic Leadership council, and various student government groups.

There is a Middle and High School band and chorus, which performs in the winter and spring of each year, as well as at the senior graduation.