SALT LAKE CITY (AP) — The U.S. Forest Service says it supports one of the last U.S. ski resorts to prohibit snowboarding in a court battle over a ban that snowboarders call discriminatory.

The decision by the Alta ski area to promote a snowboarder-free experience to lure skiers and keep them safe is a rational rule that violates no constitutional rights, attorneys for the Forest Service said in court arguments filed this week.