Section 13.905 - Group size(a) The following are prohibited: (1) Group sizes exceeding 12 individuals on the east side of the park outside the Frontcountry Developed Area as defined by this subpart.(2) Group sizes exceeding 6 individuals on the west side of the park outside the Frontcountry Developed Area as defined by this subpart.(b) A map showing the east and west boundaries is available at the park visitor center.(c) The superintendent may authorize larger groups on a case-by-case basis. 73 FR 67393 , Nov. 14, 2008