This is one of the more unique historic bridges to be encountered, because of its unusual combination of concrete and steel spans that from a visual perspective are both worthy of being considered "main spans." The bridge has a steel Strauss heel-trunnion bascule span, which is 226 feet long. East of this span are two concrete rainbow arch spans, each 102 feet in length. The rainbow arch spans and the bascule span would each be historically and technologically significant on their own as separate bridges, and so together they are highly significant. This combination of spans made of completely different materials and completely different designs creates a beautiful contrast. It should also be noted that there are a few small concrete slab approach spans on this bridge as well. The rainbow arch spans are of substantial span length for their type, large enough that they have overhead bracing.
Both the rainbow arch spans and the bascule span retain historic integrity by way of their lack of alteration of original materials and design. This is an outstanding bridge that should receive a high priority for preservation. The only noteworthy alteration is the replacement of the bridgetender house ca. 2007. In 1953 the original wooden deck was replaced with a metal grid deck on the bascule span and concrete deck on the approach spans. The bridge was rehabilitated in 2000.
This bridge was designed by the Strauss Bascule Bridge Company (Strauss Engineering Company), which was run by noted engineer Joseph Strauss. It may have been his involvement with California bridges like this that got his foot in the door, helping him gain the position as Chief Engineer for the design of the Golden Gate Bridge.
The bridge was built by the American Bridge Company of New York, New York, with Jenkins and Elton of Sacramento, California working as the on-site contractor.
An interesting note is that there is also a bridge in Oregon that has a steel bascule main span with rainbow arch approach spans.
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|
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|
CarCam: Eastbound Crossing
Full Motion Video
|Note: The downloadable high quality version of this video (available on the video page) is well worth the download since it offers excellent 1080 HD detail and is vastly more impressive than the compressed streaming video. Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.|
Coordinates (Latitude, Longitude):
View Bridge Location In:
© 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.