Trail Ridge Road in Rocky Mountain National Park has reopened, although visitors are reminded that they must have reservations to enter the park between 6 a.m. and 5 p.m. RELATED: Rocky Mountain National Park to start requiring online reservations during the coronavirus outbreak Visibility on the highway dropped to 100 feet on Tuesday due to blowing snow above timberline, and the storm left drifts of 6 to 8 feet in places.