US Bridges

M-1 SB Ramp over M-102 (8 Mile Rd)

Fair

Oakland County, Michigan · At N Lts of Detroit · Structure no. 000000000007860

Built
1956
69 years old, rebuilt 2003
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
119 ft
2 main spans
Daily traffic
3,095
1999 count
Owner
State
State Highway Agency

About this bridge

M-1 SB Ramp over M-102 (8 Mile Rd) is a steel stringer/multi-beam or girder carrying M-1 SB Ramp over M-102 (8 Mile Rd) in Oakland County, Michigan. It was built in 1956 and reconstructed in 2003, so it is 69 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 6 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 3,095 vehicles a day, roughly 18% of them trucks, projected to reach 3,466 by 2014. The structure is 119 ft (36.3 m) long and 66 ft wide.

Location

Open in Google Maps
CarriesM-1 SB Ramp
CrossesM-102 (8 Mile Rd)
LocationAt N Lts of Detroit
RouteState Highway 1
CountyOakland County
StateMichigan
Coordinates42.4465, -83.12527
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.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to 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 rating92.8 US tons
Inventory rating55.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length119 ft (36.3 m)
Longest span59 ft (17.9 m)
Deck width66 ft (20.1 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,095 (1999)
Projected traffic3,466 by 2014
Trucks18%
Lanes on structure3
Traffic directionOne-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-1 SB Ramp over M-102 (8 Mile Rd) built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 2003.

What condition is M-1 SB Ramp over M-102 (8 Mile Rd) 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 September 2023.

How much traffic does M-1 SB Ramp over M-102 (8 Mile Rd) carry?

About 3,095 vehicles per day (1999 count), of which roughly 18% are trucks.

How long is M-1 SB Ramp over M-102 (8 Mile Rd)?

The structure is 119 ft (36.3 m) long with a longest span of 59 ft (17.9 m) and a deck 66 ft wide.

Who owns M-1 SB Ramp over M-102 (8 Mile Rd)?

It is owned by the State Highway Agency.