FORT COLLINS, Colo. (AP) — After passing a record-breaking 4 million visitors, officials at Rocky Mountain National Park are looking at how to manage larger crowds.

The Coloradoan reports (http://noconow.co/1JUyrgq ) that the park eclipsed 4 million visitors for the first time in its history in November and saw a 21 percent increase in visitors in 2015 as compared to 2014. Park officials predict an even busier 2016 with the celebrations for the National Park Service’s 100th birthday.

Park spokeswoman Kyle Patterson says officials are not turning their attention to how to alleviate the congestion that the popularity brings. Visitors to the park this summer and fall experienced long lines and wait times at the entrance, filled parking lots and packed hiker shuttles.

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Information from: Fort Collins Coloradoan, http://www.coloradoan.com