US Bridges

I-496 EB over Forest RD

Poor

Ingham County, Michigan · In Lansing (forest Rd) · Structure no. 000000000003780

Built
1963
62 years old
Condition
Poor
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
108 ft
3 main spans
Daily traffic
29,013
2007 count
Owner
State
State Highway Agency

About this bridge

I-496 EB over Forest RD is a prestressed concrete stringer/multi-beam or girder carrying I-496 EB over Forest RD in Ingham County, Michigan. It was built in 1963, so it is 62 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 29,013 vehicles a day, roughly 7% of them trucks, projected to reach 34,953 by 2018. The structure is 108 ft (32.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-496 EB
CrossesForest RD
LocationIn Lansing (forest Rd)
RouteInterstate 496
CountyIngham County
StateMichigan
Coordinates42.70461, -84.50561
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.8 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length108 ft (32.8 m)
Longest span40 ft (12.3 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,013 (2007)
Projected traffic34,953 by 2018
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-496 EB over Forest RD built?

It was built in 1963, making it 62 years old in 2025.

What condition is I-496 EB over Forest RD in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2023.

How much traffic does I-496 EB over Forest RD carry?

About 29,013 vehicles per day (2007 count), of which roughly 7% are trucks.

How long is I-496 EB over Forest RD?

The structure is 108 ft (32.8 m) long with a longest span of 40 ft (12.3 m) and a deck 43 ft wide.

Who owns I-496 EB over Forest RD?

It is owned by the State Highway Agency.