HistoricBridges.org Menu: HistoricBridges.org Menu:

We Recommend These Resources:
Bach Steel - Experts at historic truss bridge restoration.

HistoricBridges.org: Bridge Browser

Alemany Boulevard Bridge

Alemany Boulevard Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: April 7, 2013

View Photos
and Videos
View Maps
and Links

Key Facts

Facility Carried / Feature Intersected
Alemany Boulevard Over CA-1 (Cabrillo Highway)
San Francisco: San Francisco County, California: United States
Structure Type
Concrete Cantilever Deck Girder, Fixed
Construction Date and Builder / Engineer
1950 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Main Span Length
79 Feet (24.1 Meters)
Structure Length
989 Feet (301.4 Meters)
Roadway Width
24.6 Feet (7.5 Meters)
12 Main Span(s)
NBI Number
34 0021

Historic Significance Rating (HSR)
View Information About HSR Ratings

Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This is an unusual overpass ramp that displays multiple details that are evidence of a substantial engineering effort. The bridge's superstructure is an unusual curved concrete deck girder design that is made more unusual by a cantilevered design that consists of suspended spans resting on cantilever arms. The spans that carry the ramp over the traffic lanes do not appear to display the cantilevered detail, the suspended spans only occur on the approaching spans. Additional engineering complexity in the bridge is realized by the changing elevation of the bridge as it rises and falls over the CA-1 highway, while also achieving a superelevated curve for the roadway it carries. The arched shape of the girders as well as the original concrete railings that remain on the bridge provide a graceful, streamlined appearance. Despite a relatively young 1950 construction date, this bridge is noteworthy for its lack of alteration and unusual, complex design. It was noted that the spans with the cantilever arms and suspended spans have been seismically retrofitted with cables that appear to act as a failsafe to catch the suspended span(s), should an earthquake knock them lose from the cantilever arms that they rest on.


Photo Galleries and Videos: Alemany Boulevard Bridge

View Photo Gallery
Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Photo Gallery
Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer


Maps and Links: Alemany Boulevard Bridge

Coordinates (Latitude, Longitude):

View Bridge Location In:

Bridgehunter.com: View listed bridges within a half mile of this bridge.

Bridgehunter.com: View listed bridges within 10 miles of this bridge.

Google Maps

Google Streetview (If Available)

Bing Maps


Apple Maps (Via DuckDuckGo Search)

Apple Maps (Apple devices only)


HERE We Go Maps

ACME Mapper

Waze Map

Android: Open Location In Your Map or GPS App

Flickr Gallery (Find Nearby Photos)

Wikimedia Commons (Find Nearby Photos)

Directions Via Sygic For Android

Directions Via Sygic For iOS and Android Dolphin Browser

USGS National Map (United States Only)

Historical USGS Topo Maps (United States Only)

CalTopo Maps (United States Only)

Home Top


About - Contact

© Copyright 2003-2021, HistoricBridges.org. All Rights Reserved. Disclaimer: HistoricBridges.org is a volunteer group of private citizens. HistoricBridges.org is NOT a government agency, does not represent or work with any governmental agencies, nor is it in any way associated with any government agency or any non-profit organization. While we strive for accuracy in our factual content, HistoricBridges.org offers no guarantee of accuracy. Information is provided "as is" without warranty of any kind, either expressed or implied. Information could include technical inaccuracies or errors of omission. Opinions and commentary are the opinions of the respective HistoricBridges.org member who made them and do not necessarily represent the views of anyone else, including any outside photographers whose images may appear on the page in which the commentary appears. HistoricBridges.org does not bear any responsibility for any consequences resulting from the use of this or any other HistoricBridges.org information. Owners and users of bridges have the responsibility of correctly following all applicable laws, rules, and regulations, regardless of any HistoricBridges.org information.

Admin Login