WEST GLACIER, Mont. (AP) — Glacier National Park officials say the entire length of the Going-to-the-Sun Road is open to vehicle traffic for the summer.

Park Superintendent Chas Cartwright said getting the road open "was extremely tough this year." A heavy snowpack and an unseasonably cool spring hampered plow crews as they tried to clear the upper section of the 50-mile road.

"The Big Drift" snow bank on Logan Pass still towered about 30 feet above the road earlier this month, and Wednesday morning's opening marks the latest the historic road has ever opened due to weather.

Park officials say the Logan Pass Visitor Center also opened Wednesday.

Jean Tabbert, NPS