Built in 1900 it was abandoned in 1929 after the new Cascade Tunnel opened. In 1910 on March 1 96 people were killed in an avalanche at this spot including 35 GN personel on a train which was held at this spot due to the weather conditions.
Abandoned tunnel under the Cascade Mountains on abandoned Great Northern Railway grade
The Original Cascade Tunnel was finished in 1900 and was built to replace a series of 8 switchbacks used to get over the mountains. Deadliest avalanche in US history occurred March 1, 1910 at Wellington (western portal). 96 people killed.
It was 2.6 miles long and had a grade of 1.7% (1 in 58.8ft). After the Wellington Avalanche in 1910 concrete snowsheds were constructed to help with snow control. In 1929 the New Cascade Tunnel at 7.8 miles was completed below the old tunnel and all switchbacks and the old tunnel were abandoned.
Total length: 14,508.0 ft. (2.7 mi.)
Approximate latitude, longitude
+47.74872, -121.12272(decimal degrees) 47°44'55" N, 121°07'22" W (degrees°minutes'seconds")