Mill River Union High School, commonly known as Mill River or MRU, is a public juniorsenior high school in Clarendon, Vermont. and is part of the Rutland South Supervisory Union. RSSU includes the towns of Clarendon, Wallingford, Shrewsbury and Tinmouth. Other towns whose students attend Mill River include Ira, Middletown Springs and Danby. The current principal is Todd Finn and the assistant principal is Tyler Weidman. The current superintendent of the district is Dave Younce.


Mill River competes in Division II in Vermont in all sports except Football and Track & Field, where they compete in Division III. It competes in the local Marble Valley League (MVL).


  • The girls’ soccer team was ranked #1 in the state in 2004 and 2005.
  • The football team won the 8-man state championship in 1994 & were runners up in 2013 for 11-man.
  • The girls’ basketball team won the state championship in 2015 and were runners up in 2016 and 2017.
  • The varsity cheer team has won states in 1985, 1990, 1992, 1994, 2002, 2016 & 2018.
  • The varsity cheerleading program has been undefeated in regular season for 3 straight years!
  • The varsity baseball team won the 2014 State Championship beating #1 Harwood 7-4!
  • MRUs Unified Basketball team competed in the State Championship game at UVM in May of 2018.  They lost to Belcate Academy and were the 2018 VPA/SOA Runners-Up!


Mill River Union High School’s Music program is has some of the most talented students from New England. Kristin Cimonetti is the vocal music director and Peter Roach is the instrumental music director. They offer both a senior chorus and band, as well as a middle school chorus and band open to every student in the school. They also offer Honors level groups such as Chamber Singers, (bass and treble voices), the Clef Hangers (bass voices), the Tempo Tantrums (treble voices), Cantiamo (bass unchanged), Vivace (treble unchanged), as well as Jazz Ensemble and Jazz Lab. They also teach a variety of general music classes including College Level Theory, Rock 2 Rap (a music appreciation history class) Digital Composition and Recording, as well as offering several independent studies ranging from composition to jazz studies to performance. Students who participate in the music program are accepted into the New England festival, All-State festival, Northeast Instrumental Music Festival, and District five music festivals annually. Mill River prides itself on its balance of arts, athletics, and academics and that is why over 30% of the student population takes part in the music department.

Mill River’s theater company is Stage 40. This is run by a student board of directors. Each season it performs three shows, and helps the middle school (Stage 20) run a spring play. The 2007-2008 season included The Pirates of Penzance by Gilbert & Sullivan. The fall show was an adaptation of Roald Dahl‘s The Twits. The 2009-2010 season included Splendor in the Grass, by William Inge, based on the film of the same name, directed by Elia Kazan; Discourse on Dissent, a series of shorts based on war themes; and The Witches. The Middle school did a performance of Alice in Wonderland. Other productions have included, Sam Shepard’s Geography of a Horse Dreamer, Slavomir Mrozek’s, Fox Hunt, and Ted Hughes’, The Pig Organ.