US Bridges

M-85 SB over I-75 NB

Good

Wayne County, Michigan · @ M-85 · Structure no. 000000000011644

Built
2005
20 years old, rebuilt 2008
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
344 ft
2 main spans
Daily traffic
5,233
2007 count
Owner
State
State Highway Agency

About this bridge

M-85 SB over I-75 NB is a steel stringer/multi-beam or girder carrying M-85 SB over I-75 NB in Wayne County, Michigan. It was built in 2005 and reconstructed in 2008, so it is 20 years old, younger 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 5,233 vehicles a day, roughly 19% of them trucks, projected to reach 10,200 by 2028. The structure is 344 ft (104.7 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesM-85 SB
CrossesI-75 NB
Location@ M-85
RouteState Highway 85
CountyWayne County
StateMichigan
Coordinates42.08517, -83.24168
Functional classUrban Other Principal Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length344 ft (104.7 m)
Longest span184 ft (56 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,233 (2007)
Projected traffic10,200 by 2028
Trucks19%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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-85 SB over I-75 NB built?

It was built in 2005, making it 20 years old in 2025. It was reconstructed in 2008.

What condition is M-85 SB over I-75 NB 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 July 2024.

How much traffic does M-85 SB over I-75 NB carry?

About 5,233 vehicles per day (2007 count), of which roughly 19% are trucks.

How long is M-85 SB over I-75 NB?

The structure is 344 ft (104.7 m) long with a longest span of 184 ft (56 m) and a deck 47 ft wide.

Who owns M-85 SB over I-75 NB?

It is owned by the State Highway Agency.