SALT LAKE CITY (AP) - The U.S. Forest Service is backing one of the last U.S. ski resorts to prohibit snowboarding in a court battle over the ban.

SALT LAKE CITY (AP) The U.S. Forest Service is backing one of the last U.S. ski resorts to prohibit snowboarding in a court battle over the ban.

Attorneys for the Forest Service say in court arguments filed this week that the decision by the Alta ski area in Utah to promote a snowboarder-free experience to lure skiers is a rational finding that violates no constitutional rights.

Four snowboarders filed the lawsuit in federal court in January. They're claiming discrimination on national forest lands that make up most of the Alta ski area in the mountains east of Salt Lake City.

The Forest Service brief comes a week after Alta lawyers argued that the lawsuit degrades the U.S. Constitution and should be thrown out.

Attorneys for the snowboarders say both filings mischaracterize the complaint, confuse applicable law and avoid the key issues.