US Bridges

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

Fair

Ingham County, Michigan · In Lansing · Structure no. 000000000003738

Built
1970
55 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
198 ft
4 main spans
Daily traffic
33,378
2007 count
Owner
State
State Highway Agency

About this bridge

M-99 (mlk Ave Nb) over I-496 is a steel stringer/multi-beam or girder carrying M-99 (mlk Ave Nb) over I-496 in Ingham County, Michigan. It was built in 1970, 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 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 33,378 vehicles a day, roughly 3% of them trucks, projected to reach 35,700 by 2028. The structure is 198 ft (60.5 m) long and 69 ft wide.

Location

Open in Google Maps
CarriesM-99 (mlk Ave Nb)
CrossesI-496
LocationIn Lansing
RouteState Highway 99
CountyIngham County
StateMichigan
Coordinates42.7259, -84.56726
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 10 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.8 US tons
Inventory rating42.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length198 ft (60.5 m)
Longest span69 ft (21 m)
Deck width69 ft (21.1 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,378 (2007)
Projected traffic35,700 by 2028
Trucks3%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway and pedestrian
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 (mlk Ave Nb) over I-496 built?

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

What condition is M-99 (mlk Ave Nb) 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 November 2024.

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

About 33,378 vehicles per day (2007 count), of which roughly 3% are trucks.

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

The structure is 198 ft (60.5 m) long with a longest span of 69 ft (21 m) and a deck 69 ft wide.

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

It is owned by the State Highway Agency.