US Bridges

23 Mile Road over Kalamazoo River

Good

Calhoun County, Michigan · Marengo Twp Sec 26 · Structure no. 000000000001332

Built
2013
12 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
82 ft
1 main span
Daily traffic
587
2013 count
Owner
County
County Highway Agency

About this bridge

23 Mile Road over Kalamazoo River is a prestressed concrete stringer/multi-beam or girder carrying 23 Mile Road over Kalamazoo River in Calhoun County, Michigan. It was built in 2013, so it is 12 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 587 vehicles a day, roughly 7% of them trucks, projected to reach 1,060 by 2033. The structure is 82 ft (25 m) long and 33 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Carries23 Mile Road
CrossesKalamazoo River
LocationMarengo Twp Sec 26
RouteCounty Highway 1375
Coordinates42.26819, -84.84768
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.6 US tons
Inventory rating62.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length82 ft (25 m)
Longest span79 ft (24.2 m)
Deck width33 ft (10.1 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic587 (2013)
Projected traffic1,060 by 2033
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 23 Mile Road over Kalamazoo River built?

It was built in 2013, making it 12 years old in 2025.

What condition is 23 Mile Road over Kalamazoo River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does 23 Mile Road over Kalamazoo River carry?

About 587 vehicles per day (2013 count), of which roughly 7% are trucks.

How long is 23 Mile Road over Kalamazoo River?

The structure is 82 ft (25 m) long with a longest span of 79 ft (24.2 m) and a deck 33 ft wide.

Who owns 23 Mile Road over Kalamazoo River?

It is owned by the County Highway Agency.