US Bridges

M-99 over I-94

Fair

Jackson County, Michigan · @ M-99 · Structure no. 000000000004424

Built
1959
66 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Concrete Continuous
Length
228 ft
4 main spans
Daily traffic
3,110
2014 count
Owner
State
State Highway Agency

About this bridge

M-99 over I-94 is a concrete continuous tee beam carrying M-99 over I-94 in Jackson County, Michigan. It was built in 1959, so it is 66 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 3,110 vehicles a day, roughly 5% of them trucks, projected to reach 3,576 by 2034. The structure is 228 ft (69.6 m) long and 37 ft wide.

Location

Open in Google Maps
CarriesM-99
CrossesI-94
Location@ M-99
RouteState Highway 99
CountyJackson County
StateMichigan
Coordinates42.26303, -84.7084
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionJanuary 2025
Inspection intervalevery 4 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 rating57.9 US tons
Inventory rating33.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length228 ft (69.6 m)
Longest span71 ft (21.7 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,110 (2014)
Projected traffic3,576 by 2034
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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-99 over I-94 built?

It was built in 1959, making it 66 years old in 2025.

What condition is M-99 over I-94 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 January 2025.

How much traffic does M-99 over I-94 carry?

About 3,110 vehicles per day (2014 count), of which roughly 5% are trucks.

How long is M-99 over I-94?

The structure is 228 ft (69.6 m) long with a longest span of 71 ft (21.7 m) and a deck 37 ft wide.

Who owns M-99 over I-94?

It is owned by the State Highway Agency.