This bridge is an impressive example of a Strauss type heel-trunnion bascule bridge. This particular example has an unusual detail especially compared to the few other heel-trunnion bridges found in this region of California. The towers for each of the counterweights normally assumes a triangle shape under the counterweight. In many cases, including with the other heel-trunnion bascule bridges in this region, the tower (just by chance) also functions as a very short span of the bridge. On the Freeport Bridge however, the counterweight tower has been enlarged and extended so that it is much longer and takes on the form of a Pratt through truss. As a result, the counterweight tower also functions as an approach span of substantial length. Doing this would either reduce the number of approach spans the bridge needed, or reduced the length of other approach spans. As such, this extension of the counterweight tower was likely a purposeful decision to achieve one of those benefits.
The bridge also includes a fixed Warren pony truss approach span (101 feet long), as well as a couple stringer spans. These spans are not original to the bridge. The Warren pony truss was added to the east end of the bridge in 1938. In 1955 an extremely rare and unusual feature... two Kingpost truss spans... were removed and replaced with the steel stringer spans.
Although the bridge tender house is not original (estimated date ca. 1997), the remainder of the bridge appears to be largely unaltered and thus the bridge's historic integrity is good. Charles W. Deterding was the county engineer when this bridge was built.
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 |
|
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 |
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. |
|
CarCam: Westbound 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. |
© Copyright 2003-2018, 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.