What is called Lock and Dam Number 15 includes a lock system, plus a dam system that includes an access bridge that cranes and other maintenance vehicles can use. The dam is an impressive structure that is noteworthy because it is an unusual type of dam called an "Active Roller Dam." A roller dam means that it has rollers to disperse the energy of water falling over the dam and thus reduce erosion risk. The "active" roller dams can move the giant steel rollers as needed. They are sometimes called a roller gate. Lock and Dam Number 15 is reportedly the largest active roller dam in the world.
The bridge structure is also extremely noteworthy since it follows the rare K-truss configuration. The K-truss was invented to make the Quebec Bridge's construction easier. Afterwards, the configuration was used on rare occasions on other bridge types. Surviving examples of k-truss bridges are historically significant due to their rarity. This example is significant on its own as a K-truss bridge and also as part of a the significant dam structure.
Above: Historical photo showing bridge construction.
This bridge is tagged with the following special condition(s): Unorganized Photos
Coordinates (Latitude, Longitude):
Search For Additional Bridge Listings:
© Copyright 2003-2024, 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.