No votes cast

Pilarcitos Creek Bridge


Pilarcitos Creek bridge plaque

Photo taken by Brian Smith, submitted by Craig Philpott


BH Photo #198225


Street View 


HalfMoon Bay's Pilarcitos Creek Bridge, also known as the Main Street Bridge, was built in early 1900 across Pilarcitos Creek, adjacent to Zaballa House and SpanishTown. It was the first concrete bridge built in San Mateo County, and remains possibly the oldest prestressed concrete bridge in the world. It is also the second oldest surviving example of a steel reinforced concrete arch bridge in California. Approximately 80 feet long, and with a useful width of 24.3 feet, the bridge retains a high degree of historic integrity as it is fundamentally unaltered from its original construction. [NRHP form]


Concrete arch bridge over Pilarcitos Creek on Main Street in Half Moon Bay
Half Moon Bay, San Mateo County, California
Open to traffic
Built 1900
- D. Bromfield & C. Tobey Jr. (Engineers)
- R.C. Mattingly & W. Heafey (Contractors)
Length of largest span: 60.0 ft.
Total length: 80.1 ft.
Deck width: 24.3 ft.
Posted to the National Register of Historic Places on April 7, 2014
Also called
Main Street Bridge
Approximate latitude, longitude
+37.46583, -122.42889   (decimal degrees)
37°27'57" N, 122°25'44" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/550503/4146703 (zone/easting/northing)
Quadrangle map:
Half Moon Bay
Average daily traffic (as of 2011)
Inventory numbers
CA 35C-25 (California bridge number)
NRHP 14000110 (National Register of Historic Places reference number)
BH 11470 (Bridgehunter.com ID)
Inspection report (as of July 2015)
Overall condition: Fair
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Very Good (8 out of 9)
Deck condition rating: (N out of 9)
Sufficiency rating: 49.1 (out of 100)
View more at BridgeReports.com

Update Log 

  • August 9, 2014: Updated by Dave King: Adjusted NRHP status - Listed
  • April 20, 2014: Updated by Craig Philpott: updated bridge, added photos
  • April 14, 2014: Updated by Luke Harden: Bridge is also doomed
  • April 14, 2014: New photo from Brian Smith
  • April 29, 2011: New photo from Craig Philpott
  • May 23, 2010: New Street View added by Craig Philpott



Pilarcitos Creek Bridge
Posted April 14, 2014, by Luke Harden (lukemh9 [at] gmail [dot] com)
Pilarcitos Creek Bridge
Posted April 14, 2014, by Luke Harden (lukemh9 [at] gmail [dot] com)