Hi-Line Railroad Bridge

It currently remains one of the longest and highest single track railroad viaducts in the United States, and was designated as a National Historic Civil Engineering Landmark by the American Society of Civil Engineers in 2005.

[1] The Northern Pacific Railroad designed and built the bridge to avoid the steep grades into and out of the Sheyenne River valley.

At one time, this was a main link in the railroad's coast-to-coast system and was important during both World Wars.

[2][3][4] The 61 spans of the bridge are supported on 30 steel towers, each of which is 45 feet long at the top.

Two of these long spans are above the Sheyenne River and the third crosses over tracks of the former Soo Line Railroad, now part of the Canadian Pacific Railway.