A total of 793,880 acres (36% of the park) were affected by the wildfires. The entire park closed to all non-emergency personnel for the first time in its history. The fires were considered unprecedented at the time.
I visited the park in 2011 and the effects were still quite visible 23 years later.
The Park rebounded quickly, though. The fire was even beneficial in some ways.
According to Wikipedia "The recovery from the fires...