US Bridges

I-496 WB Ramp over Jackson & Lansing RR

Fair

Ingham County, Michigan · In Lansing · Structure no. 000000000003765

Built
1970
55 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
218 ft
3 main spans
Daily traffic
4,200
1988 count
Owner
State
State Highway Agency

About this bridge

I-496 WB Ramp over Jackson & Lansing RR is a steel stringer/multi-beam or girder carrying I-496 WB Ramp over Jackson & Lansing RR 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 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 4,200 vehicles a day, roughly 8% of them trucks, projected to reach 3,660 by 1977. The structure is 218 ft (66.4 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-496 WB Ramp
CrossesJackson & Lansing RR
LocationIn Lansing
RouteInterstate 496
CountyIngham County
StateMichigan
Coordinates42.72619, -84.54268
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionSeptember 2023
Inspection intervalevery 24 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 geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating82.9 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length218 ft (66.4 m)
Longest span76 ft (23.1 m)
Deck width27 ft (8.1 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,200 (1988)
Projected traffic3,660 by 1977
Trucks8%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 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 I-496 WB Ramp over Jackson & Lansing RR built?

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

What condition is I-496 WB Ramp over Jackson & Lansing RR 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 September 2023.

How much traffic does I-496 WB Ramp over Jackson & Lansing RR carry?

About 4,200 vehicles per day (1988 count), of which roughly 8% are trucks.

How long is I-496 WB Ramp over Jackson & Lansing RR?

The structure is 218 ft (66.4 m) long with a longest span of 76 ft (23.1 m) and a deck 27 ft wide.

Who owns I-496 WB Ramp over Jackson & Lansing RR?

It is owned by the State Highway Agency.