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UP - Tunnel 37


West Portal Of Tunnel 37, Contextual View To East-Southeast, 135mm Lens

Photo taken by Ed Anderson for the Historic American Engineering Record

View photos at Library of Congress

BH Photo #299207



The Central Pacific First Transcontinental Railroad is a segment of the western half of the first transcontinental railroad, built from Sacramento, California to Promontory Summit, Utah between 1863 and 1869, where it joined the Union Pacific Railroad which had built west from Omaha. For the purpose of the current project, the first transcontinental railroad was found likely to be eligible for the National Register of Historic Places at the national level of significance under Criterion A for its significance in transportation history, in uniting the East and the West, and in the development of the West. The railroad's period of significance is 1869 to 1945, from the line's completion in 1869, through the years of its role in the settlement and development of the West, to the conclusion of the railroad's achievements in World War II. Tunnel 37 is a contributive element of this historic property.

Tunnel 37 is a 411-foot, single track railroad tunnel, with reinforced concrete portals and wingwalls. The wingwalls are notched, originally to carry supporting beams of adjacent timber snowsheds. Today the east portal of the tunnel is protected by a snowshed of prefabricated concrete panels erected in the mid-1980s. The tunnel is on a five degree, fifteen minute right curve, and carries the tracks of the Union Pacific Railroad's (formerly Southern Pacific) Donner Pass line.

-- Historic American Engineering Record


Tunnel on Union Pacific Railroad
Nevada County, California
Open to traffic
Built 1925
- Central Pacific Railway (CPRR)
- Southern Pacific Railroad (SP)
- Union Pacific Railroad (UP)
Total length: 411.0 ft.
Approximate latitude, longitude
+39.32520, -120.57419   (decimal degrees)
39°19'31" N, 120°34'27" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/709102/4355671 (zone/easting/northing)
Quadrangle map:
Cisco Grove
Inventory number
BH 63443 (Bridgehunter.com ID)

Update Log 

  • October 9, 2014: Added by Dave King


  • Dave King - DKinghawkfan [at] hotmail [dot] com
  • HAER CA-210 - Central Pacific Transcontinental Railroad, Tunnel No. 37, Milepost 177.79, Yuba Pass, Nevada County, CA