US Bridges

I-496 EB over CSX RR & Trowbridge Rmp

Poor

Ingham County, Michigan · In East Lansing · Structure no. 000000000003757

Built
1963
62 years old
Condition
Poor
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
304 ft
3 main spans
Daily traffic
34,668
2015 count
Owner
State
State Highway Agency

About this bridge

I-496 EB over CSX RR & Trowbridge Rmp is a steel stringer/multi-beam or girder carrying I-496 EB over CSX RR & Trowbridge Rmp 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.

It carries about 34,668 vehicles a day, roughly 7% of them trucks, projected to reach 34,953 by 2018. The structure is 304 ft (92.7 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-496 EB
CrossesCSX RR & Trowbridge Rmp
LocationIn East Lansing
RouteInterstate 496
CountyIngham County
StateMichigan
Coordinates42.7202, -84.50477
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be 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 rating66.8 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length304 ft (92.7 m)
Longest span112 ft (34.2 m)
Deck width48 ft (14.6 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,668 (2015)
Projected traffic34,953 by 2018
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
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 CSX RR & Trowbridge Rmp built?

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

What condition is I-496 EB over CSX RR & Trowbridge Rmp 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 December 2024.

How much traffic does I-496 EB over CSX RR & Trowbridge Rmp carry?

About 34,668 vehicles per day (2015 count), of which roughly 7% are trucks.

How long is I-496 EB over CSX RR & Trowbridge Rmp?

The structure is 304 ft (92.7 m) long with a longest span of 112 ft (34.2 m) and a deck 48 ft wide.

Who owns I-496 EB over CSX RR & Trowbridge Rmp?

It is owned by the State Highway Agency.