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Lock and Dam Number 15

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Lock and Dam Number 15

Primary Photographer(s): Nathan Holth

Bridge Documented: August 11, 2013 and October 15, 2021

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Facility Carried / Feature Intersected
Dam Access Road Over Mississippi River
Location
Davenport and Rock Island: Scott County, Iowa and Rock Island County, Illinois: United States
Construction Date and Builder / Engineer
1934 By Builder/Contractor: American Bridge Company of New York, New York
Rehabilitation Date
Not Available or Not Applicable
Main Span Length
115.5 Feet (35.2 Meters)
Structure Length
1,270.0 Feet (387.1 Meters)
Roadway Width
17 Feet (5.18 Meters)
Spans
11 Main Span(s)
Inventory Number
Not Applicable

Historic Significance Rating (HSR)
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Bridge Documentation

View Historic American Engineering Record (HAER) Documentation For This Bridge

HAER Original Plans, PDF - HAER Data Pages, PDF

View Historical Articles About This Bridge

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

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Photo Galleries and Videos: Lock and Dam Number 15

 

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Maps and Links: Lock and Dam Number 15

Coordinates (Latitude, Longitude):

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Bridgehunter.com: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

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HistoricBridges.org Bridge Browser: View listed bridges within 10 miles (16 kilometers) of this bridge.

2021 National Bridge Inventory: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

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