Gill Coliseum is a multi-purpose indoor arena in the northwest United States, located on the campus of Oregon State University in Corvallis, Oregon. Opened in December 1949, the arena currently lists a seating capacity of 9,301 and is home to the Oregon State Beavers' basketball, wrestling, volleyball, and gymnastics teams. It is named after Amory …Gill Coliseum is a multi-purpose indoor arena in the northwest United States, located on the campus of Oregon State University in Corvallis, Oregon. Opened in December 1949, the arena currently lists a seating capacity of 9,301 and is home to the Oregon State Beavers' basketball, wrestling, volleyball, and gymnastics teams. It is named after Amory T. "Slats" Gill, the Beavers' basketball coach for 36 seasons, who compiled a 599–392 record.