Seating and Surface
The stadium's original capacity was 72,000, but Fielding Yost made certain to install footings that could allow for expansion up to 200,000 seats. Initially, all seating consisted of wooden bleachers. These were replaced with permanent metal seating in 1949 by Crisler, who was athletic director at the time. From 1927 to 1968, the stadium's field was covered in natural grass. This was replaced with TartanTurf in 1969 to give players better traction. However, this surface was thought to be unforgiving on players' joints, and the stadium returned to natural turf in 1991. This too became problematic, as the field's below-surface location near the water table made it difficult for grass to permanently take root. The field was converted to FieldTurf, an artificial surface designed to give grass-like playing characteristics, in 2003. In 2010, it was upgraded with a brighter and higher quality version of field turf called Duraspine.
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