US Bridges

I-96 WB over M-99

Fair

Ingham County, Michigan · @ M-99 · Structure no. 000000000003803

Built
1962
63 years old, rebuilt 2023
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
199 ft
4 main spans
Daily traffic
23,950
2023 count
Owner
State
State Highway Agency

About this bridge

I-96 WB over M-99 is a steel stringer/multi-beam or girder carrying I-96 WB over M-99 in Ingham County, Michigan. It was built in 1962 and reconstructed in 2023, 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 23,950 vehicles a day, roughly 13% of them trucks, projected to reach 26,463 by 2043. The structure is 199 ft (60.7 m) long and 46 ft wide.

Location

Open in Google Maps
CarriesI-96 WB
CrossesM-99
Location@ M-99
RouteInterstate 96
CountyIngham County
StateMichigan
Coordinates42.66499, -84.58914
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
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 19 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating37.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length199 ft (60.7 m)
Longest span59 ft (18 m)
Deck width46 ft (14 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,950 (2023)
Projected traffic26,463 by 2043
Trucks13%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$131,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-96 WB over M-99 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2023.

What condition is I-96 WB over M-99 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 I-96 WB over M-99 carry?

About 23,950 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is I-96 WB over M-99?

The structure is 199 ft (60.7 m) long with a longest span of 59 ft (18 m) and a deck 46 ft wide.

Who owns I-96 WB over M-99?

It is owned by the State Highway Agency.