fieldturf was first installed in 2000 and replaced in 2006, preceded by the sand-filled omniturf of 1990. the original playing surface at martin stadium in 1972 was astroturf, replaced by superturf in 1979, and again in 1984. the playing surface at rogers field was natural grass. the elevation of the field is approximately above sea level, which was the highest in the pac-10, but is a distant third in the pac-12.