US Bridges

M-40 over Rabbit River

Fair

Allegan County, Michigan · In Hamilton · Structure no. 000000000000138

Built
1935
90 years old, rebuilt 1984
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
150 ft
3 main spans
Daily traffic
11,100
2013 count
Owner
State
State Highway Agency

About this bridge

M-40 over Rabbit River is a steel stringer/multi-beam or girder carrying M-40 over Rabbit River in Allegan County, Michigan. It was built in 1935 and reconstructed in 1984, so it is 90 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 6 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 11,100 vehicles a day, roughly 5% of them trucks, projected to reach 21,140 by 2018. The structure is 150 ft (45.7 m) long and 54 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesM-40
CrossesRabbit River
LocationIn Hamilton
RouteState Highway 40
CountyAllegan County
StateMichigan
Coordinates42.67514, -86.00332
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to 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 alignment7: Better than present minimum criteria
Operating rating107.1 US tons
Inventory rating67.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length150 ft (45.7 m)
Longest span59 ft (17.9 m)
Deck width54 ft (16.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,100 (2013)
Projected traffic21,140 by 2018
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-40 over Rabbit River built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1984.

What condition is M-40 over Rabbit River 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 May 2023.

How much traffic does M-40 over Rabbit River carry?

About 11,100 vehicles per day (2013 count), of which roughly 5% are trucks.

How long is M-40 over Rabbit River?

The structure is 150 ft (45.7 m) long with a longest span of 59 ft (17.9 m) and a deck 54 ft wide.

Who owns M-40 over Rabbit River?

It is owned by the State Highway Agency.