US Bridges

M-3 (gratiot Ave) over I-375

Fair

Wayne County, Michigan · Downtown Detroit · Structure no. 000000000011799

Built
1963
62 years old, rebuilt 1996
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
299 ft
5 main spans
Daily traffic
12,807
2007 count
Owner
State
State Highway Agency

About this bridge

M-3 (gratiot Ave) over I-375 is a steel stringer/multi-beam or girder carrying M-3 (gratiot Ave) over I-375 in Wayne County, Michigan. It was built in 1963 and reconstructed in 1996, 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 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 12,807 vehicles a day, roughly 9% of them trucks, projected to reach 11,335 by 2018. The structure is 299 ft (91.1 m) long and 120 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesM-3 (gratiot Ave)
CrossesI-375
LocationDowntown Detroit
RouteState Highway 3
CountyWayne County
StateMichigan
Coordinates42.34016, -83.04134
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating63.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length299 ft (91.1 m)
Longest span78 ft (23.7 m)
Deck width120 ft (36.5 m)
Roadway width90 ft (27.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,807 (2007)
Projected traffic11,335 by 2018
Trucks9%
Lanes on structure8
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 M-3 (gratiot Ave) over I-375 built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1996.

What condition is M-3 (gratiot Ave) over I-375 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 M-3 (gratiot Ave) over I-375 carry?

About 12,807 vehicles per day (2007 count), of which roughly 9% are trucks.

How long is M-3 (gratiot Ave) over I-375?

The structure is 299 ft (91.1 m) long with a longest span of 78 ft (23.7 m) and a deck 120 ft wide.

Who owns M-3 (gratiot Ave) over I-375?

It is owned by the State Highway Agency.