It is the longest railroad tunnel in the United States and was constructed by the Great Northern Railway, being put in service on January 12, 1929. The new tunnel reduced the summit by 501 feet (153 m) (to an altitude of 2,881 feet/878 metres) from the original tunnel, which had suffered problems with fumes, and was itself built to avoid problems caused by heavy winter snowfalls on the original line that had eight switchbacks
Total length: 41,200.0 ft. (7.8 mi.)
New Cascade Tunnel
Great Northern Railway Cascade Tunnel #15
Approximate latitude, longitude
+47.71532, -121.14522(decimal degrees) 47°42'55" N, 121°08'43" W (degrees°minutes'seconds")
Approximate UTM coordinates
USGS topographic map
BH 41926 (Bridgehunter.com ID)
April 30, 2012: Updated by Luke Harden: Refined builder name.
April 30, 2012: Updated by Neil Martel: Added builder
April 7, 2012: Updated by Luke Harden: Added category "Great Northern Railway"
April 7, 2012: Updated by Neil Martel: Updated alternate name
September 9, 2010: New photos from Nathan Morton
March 13, 2010: Updated by Ed Hollowell: GPS location