US Bridges

M-99 (mlk Ave Sb) over I-496

Fair

Ingham County, Michigan · In Lansing · Structure no. 000000000003747

Built
1970
55 years old, rebuilt 1993
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
190 ft
4 main spans
Daily traffic
32,920
2007 count
Owner
State
State Highway Agency

About this bridge

M-99 (mlk Ave Sb) over I-496 is a prestressed concrete stringer/multi-beam or girder carrying M-99 (mlk Ave Sb) over I-496 in Ingham County, Michigan. It was built in 1970 and reconstructed in 1993, so it is 55 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 32,920 vehicles a day, roughly 3% of them trucks, projected to reach 19,919 by 2018. The structure is 190 ft (58 m) long and 66 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesM-99 (mlk Ave Sb)
CrossesI-496
LocationIn Lansing
RouteState Highway 99
CountyIngham County
StateMichigan
Coordinates42.72616, -84.56976
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.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 9 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length190 ft (58 m)
Longest span62 ft (19 m)
Deck width66 ft (20.2 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,920 (2007)
Projected traffic19,919 by 2018
Trucks3%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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-99 (mlk Ave Sb) over I-496 built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 1993.

What condition is M-99 (mlk Ave Sb) over I-496 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 December 2024.

How much traffic does M-99 (mlk Ave Sb) over I-496 carry?

About 32,920 vehicles per day (2007 count), of which roughly 3% are trucks.

How long is M-99 (mlk Ave Sb) over I-496?

The structure is 190 ft (58 m) long with a longest span of 62 ft (19 m) and a deck 66 ft wide.

Who owns M-99 (mlk Ave Sb) over I-496?

It is owned by the State Highway Agency.