with Autzen Stadium at the University of Oregon in hosting the annual rivalry game with the Ducks. Since 1954, the games in even-numbered years have been played in Corvallis, odd-numbered in Eugene. Playing surface Through the 1968 season, the stadium's playing surface was natural grass. AstroTurf was installed in 1969, and replaced in 1974 and 1977. The brand was switched to All-Pro artificial turf in 1984, which was in place for 15 seasons, replaced in 1999 with AstroTurf 12/2000. Infilled FieldTurf debuted in 2005, and was replaced prior to the 2012 season. Expansion and upgrades Through the 2004 season, the official capacity of the stadium stood at 35,362. In 2003 the Raising Reser campaign was initiated, which resulted in an increase of seating capacity to 43,300 for the 2005 season by way of constructing a new grandstand along the northeast sideline, with plans to eventually reach 55,000 seats through three phases of renovation. "Phase Two" of the Raising Reser project was completed between the 2006 and 2007 football seasons; it enclosed the horseshoe in the southeast end zone with continuous seating in the corners. This addition raised total seating capacity to 45,674 and included the ProStar Digital VideoPlus Display screen. During the planned Phase Three, the upper level will extend through the southwest grandstand. The north end zone is also home to the Valley Football Center, which houses a large weight room, offices and meeting facilities, reserved primarily for coaches and administrators within the football program. In December 2014, Victory Through Valley, an expansion to the stadium and Valley Football Center was announced as part of $42 million in upgrades. The renovations were scheduled to begin in Fall 2015 and were completed by the beginning of the 2016 football season. Victory Through Valley upgrades included a new auditorium, coaches offices, team room, locker room, rehab facilities, and hall of fame. The new additions and upgrades have helped with recruiting, competitiveness, and functionality. On February 4, 2021, renovations for the outdated 16,956-seat southwest grandstand were revealed to the public. Construction began on December 1st, 2021, and will be completed in time for the 2023 football season. Although the renovation will lower Reser Stadium's total capacity to between 34,000 and 39,000, the new grandstand will be larger in size than its predecessor. The grandstand is taller than the old southwest side, allowing seats to be much closer to the field. This design