US Bridges

M-1 over M-102 (8 MI Rd) & Ramps

Fair

Oakland County, Michigan · N Lts of Detroit · Structure no. 000000000007858

Built
1956
69 years old, rebuilt 2006
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
754 ft
4 main spans
Daily traffic
19,126
2007 count
Owner
State
State Highway Agency

About this bridge

M-1 over M-102 (8 MI Rd) & Ramps is a steel stringer/multi-beam or girder carrying M-1 over M-102 (8 MI Rd) & Ramps in Oakland County, Michigan. It was built in 1956 and reconstructed in 2006, 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 19,126 vehicles a day, roughly 3% of them trucks, projected to reach 53,400 by 2023. The structure is 754 ft (229.8 m) long and 90 ft wide.

Location

Open in Google Maps
CarriesM-1
CrossesM-102 (8 MI Rd) & Ramps
LocationN Lts of Detroit
RouteState Highway 1
CountyOakland County
StateMichigan
Coordinates42.44636, -83.12474
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
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 alignment7: Better than present minimum criteria
Operating rating71.4 US tons
Inventory rating42.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length754 ft (229.8 m)
Longest span70 ft (21.2 m)
Deck width90 ft (27.3 m)
Roadway width83 ft (25.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,126 (2007)
Projected traffic53,400 by 2023
Trucks3%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesThird level (interchange)
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 over M-102 (8 MI Rd) & Ramps built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 2006.

What condition is M-1 over M-102 (8 MI Rd) & Ramps 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 over M-102 (8 MI Rd) & Ramps carry?

About 19,126 vehicles per day (2007 count), of which roughly 3% are trucks.

How long is M-1 over M-102 (8 MI Rd) & Ramps?

The structure is 754 ft (229.8 m) long with a longest span of 70 ft (21.2 m) and a deck 90 ft wide.

Who owns M-1 over M-102 (8 MI Rd) & Ramps?

It is owned by the State Highway Agency.