US Bridges

Walnut ST over I-496

Fair

Ingham County, Michigan · In Lansing · Structure no. 000000000003742

Built
1968
57 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
188 ft
4 main spans
Daily traffic
12,100
1988 count
Owner
State
State Highway Agency

About this bridge

Walnut ST over I-496 is a steel stringer/multi-beam or girder carrying Walnut ST over I-496 in Ingham County, Michigan. It was built in 1968, so it is 57 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 12,100 vehicles a day, roughly 3% of them trucks, projected to reach 12,650 by 2008. The structure is 188 ft (57.4 m) long and 66 ft wide.

Location

Open in Google Maps
CarriesWalnut ST
CrossesI-496
LocationIn Lansing
RouteCity Street 0
CountyIngham County
StateMichigan
Coordinates42.72611, -84.55711
Functional classUrban Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 10 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 alignment6: Equal to present minimum criteria
Operating rating66.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length188 ft (57.4 m)
Longest span63 ft (19.1 m)
Deck width66 ft (20.2 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,100 (1988)
Projected traffic12,650 by 2008
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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 Walnut ST over I-496 built?

It was built in 1968, making it 57 years old in 2025.

What condition is Walnut ST 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 Walnut ST over I-496 carry?

About 12,100 vehicles per day (1988 count), of which roughly 3% are trucks.

How long is Walnut ST over I-496?

The structure is 188 ft (57.4 m) long with a longest span of 63 ft (19.1 m) and a deck 66 ft wide.

Who owns Walnut ST over I-496?

It is owned by the State Highway Agency.