HistoricBridges.org Menu: HistoricBridges.org Menu:

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

HistoricBridges.org: Bridge Browser

Lock and Dam Number 15

Access Bridge

Lock and Dam Number 15

Primary Photographer(s): Nathan Holth

Bridge Documented: August 11, 2013

View Photos
and Videos
View Maps
and Links

Key Facts

Facility Carried / Feature Intersected
Dam Access Road Over Mississippi River
Davenport and Rock Island: Scott County, Iowa and Rock Island County, Illinois: United States
Construction Date and Builder / Engineer
1934 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
116 Feet (35.2 Meters)
Structure Length
1,270 Feet (387.1 Meters)
Roadway Width
17 Feet (5.18 Meters)
11 Main Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)
View Information About HSR Ratings

Bridge Documentation

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.


Photo Galleries and Videos: Lock and Dam Number 15

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: Lock and Dam Number 15

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