In 1908 a road was opened to the plateau .
The park was expanded to 10,406 hectares ( 25,710 acres ) ; and in 1980 to road 's current size to take in most of the surrounding foothill country .
In 1908 a road was opened to the plateau and the park was expanded to 10,406 hectares ( 25,710 acres ) ; and in 1980 to its current size to take in most of the surrounding foothill country .