US Bridges

Rosa Parks (12th) over I-75

Fair

Wayne County, Michigan · In Detroit · Structure no. 000000000011761

Built
1970
55 years old, rebuilt 1998
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
285 ft
6 main spans
Daily traffic
9,270
1978 count
Owner
State
State Highway Agency

About this bridge

Rosa Parks (12th) over I-75 is a steel continuous stringer/multi-beam or girder carrying Rosa Parks (12th) over I-75 in Wayne County, Michigan. It was built in 1970 and reconstructed in 1998, 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 9,270 vehicles a day, roughly 3% of them trucks, projected to reach 9,270 by 2010. The structure is 285 ft (86.8 m) long and 89 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesRosa Parks (12th)
CrossesI-75
LocationIn Detroit
RouteCity Street 2000
CountyWayne County
StateMichigan
Coordinates42.33314, -83.07301
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating34.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length285 ft (86.8 m)
Longest span63 ft (19.2 m)
Deck width89 ft (27.1 m)
Roadway width74 ft (22.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,270 (1978)
Projected traffic9,270 by 2010
Trucks3%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 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 Rosa Parks (12th) over I-75 built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 1998.

What condition is Rosa Parks (12th) over I-75 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 May 2023.

How much traffic does Rosa Parks (12th) over I-75 carry?

About 9,270 vehicles per day (1978 count), of which roughly 3% are trucks.

How long is Rosa Parks (12th) over I-75?

The structure is 285 ft (86.8 m) long with a longest span of 63 ft (19.2 m) and a deck 89 ft wide.

Who owns Rosa Parks (12th) over I-75?

It is owned by the State Highway Agency.