Approximately 6:15 pm today at Keystone Resort, a Zamboni doing regular maintenance fell through a patch of thin ice. Nobody was injured in the incident. However, Keystone Lake which is the largest maintained outdoor ice rinks in the US, is currently closed for an unknown amount of time. Keystone Lake in Keystone Ski Resort is at the center of the Keystone Lakeside Village. The village is host to many shops and restaurants in the area along with many different lodging options. The frozen lake serves as a large skating rink in the winter months and there is also a hockey rink setup on the lake.