Groton-Dunstable Regional High School (GDRHS) is a high school located in Groton, Massachusetts, United States, and serves the communities of Groton and Dunstable in the Groton-Dunstable Regional School District. While GDRHS is the only public high school located within those communities students from Groton may also attend the public Nashoba Valley Technical High School and students from Dunstable may attend the public Greater Lowell Technical High School. Approximately 810 students attend GDRHS and they are primarily graduates of Groton-Dunstable Regional Middle School. GDRHS has a primarily college preparatory curriculum, with approximately 87% of its students attending four-year colleges and over 90% attending two- or four-year colleges upon graduation in 2010. History The earliest incarnation of GDRHS was as the grammar school that was held in Groton town center for which there are funding records as far back as 1758. The residency of the grammar school migrated between the district schools and in 1808 was kept for four months in District school number 1, then two months in number 2, two months in number 3, and two months in number five. While Lawrence Academy had long provided private secondary school opportunities in town, a committee was appointed in November 1855 to consider establishing a new high school. On Monday, December 5, 1859 the first public high school opened in the lower hall of the Town House (Town Hall). For some time in the 1860s, the high school was held in the upper part of the Gerrish building at Groton Center, before moving into the new District Number 1 school, built in 1870 at a cost of $32,000. On March 2, 1874, the district schools, were named according to town vote with the high school being named Butler Grammar School after Caleb Butler, former principal of Lawrence Academy, and town historian. A new high school was built in 1927. Now known as the recently closed Prescott Elementary, it continued to be known as the Butler School for some time. The regional school district was established in 1967 with the high school located on Main St. in Groton. In 1997, the school adopted 4x4 block scheduling. In 1999, the "new gym" at the Main Street campus was renovated and renamed as the Peter Twomey Youth Center (PTYC) in order to honor a then recently deceased student. The PTYC is now "...a self-supporting facility that provides space for youth athletic leagues, adult education, and