US Bridges

M-60 & M-99 over S Br Kalamazoo River

Fair

Calhoun County, Michigan · In Homer · Structure no. 000000000001193

Built
1933
92 years old, rebuilt 1993
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
75 ft
1 main span
Daily traffic
5,057
2007 count
Owner
State
State Highway Agency

About this bridge

M-60 & M-99 over S Br Kalamazoo River is a prestressed concrete box beam or girders - multiple carrying M-60 & M-99 over S Br Kalamazoo River in Calhoun County, Michigan. It was built in 1933 and reconstructed in 1993, so it is 92 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 5,057 vehicles a day, roughly 16% of them trucks, projected to reach 9,960 by 2018. The structure is 75 ft (22.8 m) long and 47 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesM-60 & M-99
CrossesS Br Kalamazoo River
LocationIn Homer
RouteState Highway 60
CountyCalhoun County
StateMichigan
Coordinates42.14704, -84.80232
Functional classRural Minor 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.
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 alignment8: Equal to present desirable criteria
Operating rating81.8 US tons
Inventory rating38.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length75 ft (22.8 m)
Longest span75 ft (22.8 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,057 (2007)
Projected traffic9,960 by 2018
Trucks16%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-60 & M-99 over S Br Kalamazoo River built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1993.

What condition is M-60 & M-99 over S Br Kalamazoo 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 June 2023.

How much traffic does M-60 & M-99 over S Br Kalamazoo River carry?

About 5,057 vehicles per day (2007 count), of which roughly 16% are trucks.

How long is M-60 & M-99 over S Br Kalamazoo River?

The structure is 75 ft (22.8 m) long with a longest span of 75 ft (22.8 m) and a deck 47 ft wide.

Who owns M-60 & M-99 over S Br Kalamazoo River?

It is owned by the State Highway Agency.