HistoricBridges.org Menu: HistoricBridges.org Menu:

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

HistoricBridges.org: Bridge Browser

Marengo Bridge

23 Mile Road Bridge

Marengo Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: 2005 and November 8, 2012

View Photos
and Videos
View Maps
and Links

Key Facts

Facility Carried / Feature Intersected
23 Mile Road Over Kalamazoo River
Marengo: Calhoun County, Michigan: United States
Construction Date and Builder / Engineer
1922 By Builder/Contractor: Mead Brothers and Engineer/Design: Michigan State Highway Department

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
60 Feet (18 Meters)
Structure Length
60 Feet (18 Meters)
Roadway Width
20 Feet (6.1 Meters)
1 Main Span(s)
NBI Number

Historic Significance Rating (HSR)

Bridge Documentation

This bridge no longer exists!

Bridge Status: Demolished and replaced.

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

Learn about Michigan's Unique Concrete Camelback Bridges

This concrete camelback bridge, also known as a curved-chord through girder, appears to be the last of its kind in Calhoun County. The structure was built in 1922, and as a result is a very old example of this structure type.

The treatment of concrete camelback bridges like this one has been no better than the treatment that truss bridges get. They have survived because they were built later than most truss bridges and they were significantly overbuilt which has helped them have a long life. The bridges of this type that have been demolished are usually because these bridges are not quite wide enough to comfortably support two lanes. The preservation of these unique bridges, which were designed by Michigan and built in no other state, is important to honor and remember Michigan's innovation in the development of effective transportation systems. In addition, preservation allows these visually pleasing structure to continue to add to the desirability of the roadway and surrounding area.

Sadly, Calhoun County has done little to nothing to help extend the service life of this historic bridge. A visit to the bridge in late 2012 showed that the edges of the bridge's deck had up to four inches of dirt and grass buildup. Dirt traps moisture on the deck, and moisture leads to deterioration. Worse, the dirt can clog up or obstruct the drains on the bridge, only making the moisture buildup worse.  Funding may be tight, but removing dirt from a deck can be done by maintenance crews who are already paid and on staff at the road commission. Fixing the problem in the early stages might have involved a pothole filling crew briefly stopping at the bridge and sweep off the deck. Even now, removing the excessive buildup of dirt might only take a small in-house crew a couple hours to dig out and sweep away.

Information and Findings From Michigan Historic Bridge Inventory

MDOT Historic Bridge 23 Mile Rd. / Kalamazoo River

Narrative Description

The 23 Mile Road Bridge is eligible for the National Register as one of the oldest well-preserved examples of the state's unique curved-chord through-girder design. The Michigan State Highway Department developed its standard for the design in the 1921-1922 biennium, and built the first bridge of this type, a 90-foot span over the Raisin River at Tecumseh, in 1922. Concrete through-girder bridges fell from favor by the end of that decade because they could not be widened to accommodate increasing traffic volumes and loads.

Plans for the 23 Mile Road Bridge were prepared by the state highway department in January 1922. The bridge was subsequently built by Calhoun County as a state reward bridge. The contractor, Mead Brothers of Battle Creek, Michigan, had to dismantle the superstructure of the previous bridge, probably a steel truss, before erecting the new concrete span. Construction cost of the new bridge totaled $10,353.


Photo Galleries and Videos: Marengo Bridge

View Photo Gallery
2012 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
2012 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
View Photo Gallery
Previous Bridge Photo-Documentation
A collection of overview and detail photos, taken between 2005 and 2012. This photo gallery contains a combination of Original Size photos and Mobile Optimized photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer


Maps and Links: Marengo Bridge

This historic bridge has been demolished. This map is shown for reference purposes only.

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 2003-2020, 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.