Great Plains Lutheran High School (also known as GPLHS) is a coeducational High School in Watertown, South Dakota, United States. It is the only private high school in Watertown, South Dakota. GPLHS is owned and operated by 48 congregations belonging to the Wisconsin Evangelical Lutheran Synod (WELS). References External links Official website SDHSAA school info Private high schools in South Dakota Schools in Codington County, South Dakota Lutheran schools in South Dakota 1996 establishments in South Dakota Educational institutions established in 1996 Buildings and structures in Watertown, South Dakota Secondary schools affiliated with the Wisconsin Evangelical Lutheran Synod