The Aspen Times reports that officials are encouraging visitors to take the bus to get to the scenic area, as parking spaces fill up quickly on most days. The Roaring Fork Transportation Authority has added two more buses during the week.
Ridership on the Maroon Bells service went up nearly 30 percent in June and July, compared to the same months last year.
More Forest Service rangers, ambassadors and volunteers have been patrolling the scenic area to manage the increased visitation.
The bus service will run through Oct. 2. Silver Bell campground will remain open but Silver Bar and Silver Queen will be closed.