Bidders surround a row of classroom clocks during an auction of the Colton School and its contents. Cindy Oyen's 1967 graduating class was the last there, and her grandmother Clara Bratteboe's was the first, in 1917. "1968 was the beginning of Tri-Valley High School, and the end of Colton High School," Oyen says. Elementary grades used the school through the 1990s, but now attend Tri-Valley as well.