No votes cast

UP - Tunnel 38


West portal

Photo taken by Nathan Morton in April 2010


BH Photo #162848


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 38 is a contributive element of this historic property.

Tunnel 38 is a 921-foot single track railroad tunnel, with reinforced concrete portals and wingwalls. The wingwalls are notched, originally to carry supporting beams of adjacent timber snowsheds. The tunnel is on a six degree, five 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 UP (former SP) Railroad
Placer County, California
Open to traffic
Built 1924 by Central Pacific (later SP) Railroad
- Central Pacific Railroad (CPRR)
- Southern Pacific Railroad (SP)
- Union Pacific Railroad (UP)
Total length: 921.0 ft.
Approximate latitude, longitude
+39.30294, -120.53981   (decimal degrees)
39°18'11" N, 120°32'23" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/712133/4353280 (zone/easting/northing)
Quadrangle map:
Cisco Grove
Inventory number
BH 44927 (Bridgehunter.com ID)

Update Log 

  • October 9, 2014: HAER photos posted by Dave King
  • April 18, 2010: Added by Nathan Morton


  • Nathan Morton - morton890 [at] yahoo [dot] com
  • HAER CA-211 - Central Pacific Transcontinental Railroad, Tunnel No. 38, Milepost 180.58, Cisco, Placer County, CA