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JPBX - Santa Inez Ave Overpass


Santa Inez Ave Overpass in 2008

Photo taken by Caltrans in 2008

BH Photo #309401

Street View 


The Santa Inez Avenue Bridge (35C0090) was built in 1903 and features rolled-steel beam side spans over sidewalks with steel bents and reinforced-concrete cantilevered abutments, and a dry-laid random-ashlar masonry retaining wall. The bridge is one of four underpasses in San Mateo situated on the former Southern Pacific Railroad route between San Francisco and San Jose which are eligible for the National Register under Criterion A for their association with the development of northern San Mateo and with the growth of grade-separation construction during the early twentieth century and under Criterion C as representative of features once common to railroad underpasses that are illustrative of an important phase of development in the evolution of underpass design. Southern Pacific built the Santa Inez Avenue Bridge during the company's phase of upgrades and development during the early twentieth century. The period of significance is 1903.


Girder bridge over Santa Inez Ave on Caltrain & Union Pacific Railroad
San Mateo, San Mateo County, California
Open to traffic
Built 1903
- American Bridge Co. of New York
- Caltrain (JPBX)
- Commuter Rail
- Southern Pacific Railroad (SP)
- Union Pacific Railroad (UP)
Length of largest span: 33.1 ft.
Total length: 51.8 ft.
Also called
JPBX - Santa Inez Ave Bridge
Union Pacfifc - Santa Inez Ave Bridge
Union Pacific - Santa Inez Ave Overpass
Approximate latitude, longitude
+37.57278, -122.32889   (decimal degrees)
37°34'22" N, 122°19'44" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/559262/4158627 (zone/easting/northing)
Quadrangle map:
San Mateo
Inventory numbers
CA 35C-90 (California bridge number)
BH 64357 (Bridgehunter.com ID)

Update Log 

  • December 1, 2014: New Street View added by Dallam Oliver-Lee


  • Dallam Oliver-Lee


Caltrain - Santa Inez Ave Overpass
Posted November 24, 2019, by Anonymous

This bridge no longer exists and has since been rebuilt due to the Caltrain electrification program. The new bridge is also taller.