US Bridges

12th ST over I-475

Fair

Genesee County, Michigan · In Flint · Structure no. 000000000002655

Built
1970
55 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
237 ft
2 main spans
Daily traffic
8,322
1995 count
Owner
State
State Highway Agency

About this bridge

12th ST over I-475 is a steel stringer/multi-beam or girder carrying 12th ST over I-475 in Genesee 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 8,322 vehicles a day, roughly 4% of them trucks, projected to reach 9,195 by 2015. The structure is 237 ft (72.2 m) long and 66 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries12th ST
CrossesI-475
LocationIn Flint
RouteCity Street 2002
CountyGenesee County
StateMichigan
Coordinates43.00695, -83.67763
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 inspectionJuly 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.9 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length237 ft (72.2 m)
Longest span123 ft (37.5 m)
Deck width66 ft (20.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,322 (1995)
Projected traffic9,195 by 2015
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 km)
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 12th ST over I-475 built?

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

What condition is 12th ST over I-475 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 July 2024.

How much traffic does 12th ST over I-475 carry?

About 8,322 vehicles per day (1995 count), of which roughly 4% are trucks.

How long is 12th ST over I-475?

The structure is 237 ft (72.2 m) long with a longest span of 123 ft (37.5 m) and a deck 66 ft wide.

Who owns 12th ST over I-475?

It is owned by the State Highway Agency.