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A photo of the Denver Post Photo van on Trail Ridge Road in this undated photo.

Lou Middlemist, State Purchasing Agent, Gives Estes Park Queen Jonlyn Ver Straeten some assistance in cutting the ribbon at the Trail Ridge Road opening in 1966.

A Rotary Plow, blowing powdered snow to the side in a huge, white plume, moves up the east side of Trail Ridge Road in Rocky Mountain National Park in 1958.

Walter Charles, conductor of the Blue Jeans Philharmonic Orchestra in Estes Park, Colo., holds his $10,000 violin as he gazes at a towering snowbank on Trail Ridge Road in Rocky Mountain National Park, 1964.

This 'Midwinter' Scene is, in reality, a summer picture of national park crews caught as they worked to open the famous Trail Ridge road in the Rocky Mountain national park for traffic by May 30 in 1941. Where these men are working the snow drifts were twenty feet in depth.

Gov. Don Thornton will be at the business end of the scissors June 2 when the 60-foot rope of Colorado carnations across Trail Ridge road above Estes Park is snipped to officially open the high-altitude highway for the season in 1951. Extending the invitation to attend to the governor is Nancy Steffens, Roof Top rodeo queen, who was accompanied to the state house by Charles Herzog (left), Estes Park Chamber of Commerce director, and Estes Park Mayor Ron Brodie (right).

W.A. Colt of Lyons, Colo., celebrating his ninety-fifth birthday, "kind of likes a cigar" and attributes his lengthy life to "never worrying." He was the contractor for the Trail Ridge road, and was active in business and civic affairs since retiring in 1937.

Mt. Meeker along Trail Ridge Road photographed on June 4, 1940.

Trail Ridge Road in 1939.

Trail Ridge Road in 1941.

The descent from Milner Pass along Trail Ridge Road with the Never Summer Range in the background in 1942.

A Snowplow sends up a spray of snow in Rocky Mountain National Park as crews work hard in a hurry-up effort to have Trail Ridge Road open for the annual ribbon-cutting ceremony in 1959.

Trail Ridge Road in 1940.

This photograph was taken June 14, 1936 by Ralph B. Baird, staff photographer of The Denver Post. From the original caption: "Snow scenes like this are just a comfortable morning's drive from Denver over paved and oiled highways."

A crowd of 350 persons gathered at the 12,183-foot summit of Trail Ridge Road on Memorial Day in 1966 for the formal opening of the road between Estes Park and Grand Lake.

Mrs. John Love, wife of the Colorado governor, snips the ribbon to officially open Trail Ridge Road in 1966, the highest continuous highway in the nation.

From the original caption: "Broad, smooth highways take vacationists high into the Colorado Rockies where miles stand on end. Wide turnouts and parking areas are located at spectacular scenic spots like this section of Trail Ridge Road in Rocky Mountain National Park. Near here, the road reaches an elevation of 12,133 feet, more than two miles above sea level."

Rotary snow plow operator Larry Lewis widened the roadway along a high-altitude section of Trail Ridge Road prior to its opening to the public in 1991.

At Fall River Pass store and museum, Haines (sic) inspects the open side of building where snow has drifted around, leaving a large pit in 1960. Combination of fog and snow, called a "white-out," reduced visibility to a few feet at this stage of the Trail Ridge trip.

A snow measuring crew loads skis back into the Sno-Cat where snow cover runs out near bottom of Trail Ridge Road on their return trip in 1960.

Four members of the Rocky Mountain Park snow measuring team fan out behind their portable ski-lift, a Sno-Cat owned by Colorado Game and Fish Dept., on way to top of Trail Ridge Road in 1960. They're skimming along between gauging stations about half-way up, where snow is 5 to 10 feet deep on road.

Tourists from Boulder County at right pause near a big drift to take pictures and throw snowballs on Trail Ridge Road in Rocky Mountain National Park, 1968. Officials discourage motorists stopping near drifts, because of the danger of snowslides.

Cars begin their ribbon-like route to the sky on Trail Ridge Road northwest of Estes Park in 1957. Only the road is free from snow, which is finally beginning to melt at full rate as summer arrives.

Trail Ridge Road in 1956.

The Trail Ridge Road opening ceremony in 1956.

Ranger Gordon Patterson walks ahead of his stalled truck, six miles from the summit of Trail Ridge road, to check the deep snow which made it impossible to open the link between Estes Park and Grand Lake in 1955.

Sending a plume of snow high into the air, a rotary plow and bulldozer team open the road around Fall River museum high on Trail Ridge Road in 1955. Watching snow removal work here is Ruben Hart, assistant chief ranger.

Summit House at Trail Ridge Road in 1956.

The May 1948 Trail Ridge opening in Rocky Mountain National Park.

Participating in the 1951 Trail Ridge Road Ribbon-Cutting ceremony opening the road are Ronald Brodie, mayor of Estes Park, Gov. Daniel Thornton 鈥� cutting the rope of Colorado carnations 鈥� Shirley Yahai of Los Angeles, who was radio station KFEL's Queen for a Day, David Canfield, the superintendent of Rocky Mountain National Park, and Jake Pettingell, president of the Grand Lake Chamber of Commerce.