US Bridges

M-3 SB Conn over I-75 & I-375

Good

Wayne County, Michigan · In Detroit over I-375 · Structure no. 000000000011809

Built
1964
61 years old, rebuilt 1998
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
362 ft
7 main spans
Daily traffic
22,748
2007 count
Owner
State
State Highway Agency

About this bridge

M-3 SB Conn over I-75 & I-375 is a steel stringer/multi-beam or girder carrying M-3 SB Conn over I-75 & I-375 in Wayne County, Michigan. It was built in 1964 and reconstructed in 1998, so it is 61 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 22,748 vehicles a day, projected to reach 14,803 by 2018. The structure is 362 ft (110.2 m) long and 45 ft wide.

Location

Open in Google Maps
CarriesM-3 SB Conn
CrossesI-75 & I-375
LocationIn Detroit over I-375
RouteState Highway 3
CountyWayne County
StateMichigan
Coordinates42.34366, -83.04361
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.1 US tons
Inventory rating43.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20 + Mod
Structure length362 ft (110.2 m)
Longest span79 ft (24.1 m)
Deck width45 ft (13.6 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,748 (2007)
Projected traffic14,803 by 2018
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 SB Conn over I-75 & I-375 built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1998.

What condition is M-3 SB Conn over I-75 & I-375 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does M-3 SB Conn over I-75 & I-375 carry?

About 22,748 vehicles per day (2007 count).

How long is M-3 SB Conn over I-75 & I-375?

The structure is 362 ft (110.2 m) long with a longest span of 79 ft (24.1 m) and a deck 45 ft wide.

Who owns M-3 SB Conn over I-75 & I-375?

It is owned by the State Highway Agency.