Tree Damage and Erosion led to a recommendation to close a Golden Gate Park disc golf course in San Francisco, CA
From an article in the San Fransisco Chronicle in the April 2005:
The department’s Urban Forestry Division has recommended that the nine- hole course be taken down. Section supervisor Mike Hegerhorst inspected the course and the surrounding area last year and reported that the discs used for the sport have damaged the bark of trees and that the additional foot traffic from disc golfers has led to erosion problems.
“We encourage all manners of recreational pursuits in the park,” Recreation and Park spokeswoman Rose Marie Dennis said. “But if we infringe on the health of trees, ultimately (Marx Meadow) may not be the best place for this pursuit.”