US Bridges

M-43 (main Street) over US-131

Fair

Kalamazoo County, Michigan · 4.3 MI N of I-94 · Structure no. 000000000004561

Built
1962
63 years old, rebuilt 2013
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
230 ft
4 main spans
Daily traffic
29,352
2010 count
Owner
State
State Highway Agency

About this bridge

M-43 (main Street) over US-131 is a steel stringer/multi-beam or girder carrying M-43 (main Street) over US-131 in Kalamazoo County, Michigan. It was built in 1962 and reconstructed in 2013, so it is 63 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 29,352 vehicles a day, roughly 2% of them trucks, projected to reach 38,048 by 2018. The structure is 230 ft (70.1 m) long and 90 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesM-43 (main Street)
CrossesUS-131
Location4.3 MI N of I-94
RouteState Highway 43
CountyKalamazoo County
StateMichigan
Coordinates42.29596, -85.66356
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.1 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length230 ft (70.1 m)
Longest span80 ft (24.4 m)
Deck width90 ft (27.5 m)
Roadway width82 ft (25 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,352 (2010)
Projected traffic38,048 by 2018
Trucks2%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was M-43 (main Street) over US-131 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2013.

What condition is M-43 (main Street) over US-131 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does M-43 (main Street) over US-131 carry?

About 29,352 vehicles per day (2010 count), of which roughly 2% are trucks.

How long is M-43 (main Street) over US-131?

The structure is 230 ft (70.1 m) long with a longest span of 80 ft (24.4 m) and a deck 90 ft wide.

Who owns M-43 (main Street) over US-131?

It is owned by the State Highway Agency.