US Bridges

M-39 SB over M-10 Ramp C

Fair

Oakland County, Michigan · In Southfield (ramp C) · Structure no. 000000000007881

Built
1964
61 years old, rebuilt 2006
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
110 ft
3 main spans
Daily traffic
45,241
2007 count
Owner
State
State Highway Agency

About this bridge

M-39 SB over M-10 Ramp C is a steel stringer/multi-beam or girder carrying M-39 SB over M-10 Ramp C in Oakland County, Michigan. It was built in 1964 and reconstructed in 2006, 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 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 45,241 vehicles a day, roughly 2% of them trucks, projected to reach 38,000 by 2027. The structure is 110 ft (33.6 m) long and 47 ft wide.

Location

Open in Google Maps
CarriesM-39 SB
CrossesM-10 Ramp C
LocationIn Southfield (ramp C)
RouteState Highway 39
CountyOakland County
StateMichigan
Coordinates42.45992, -83.22127
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.3 US tons
Inventory rating57.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length110 ft (33.6 m)
Longest span43 ft (13 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45,241 (2007)
Projected traffic38,000 by 2027
Trucks2%
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-39 SB over M-10 Ramp C built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2006.

What condition is M-39 SB over M-10 Ramp C 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 October 2023.

How much traffic does M-39 SB over M-10 Ramp C carry?

About 45,241 vehicles per day (2007 count), of which roughly 2% are trucks.

How long is M-39 SB over M-10 Ramp C?

The structure is 110 ft (33.6 m) long with a longest span of 43 ft (13 m) and a deck 47 ft wide.

Who owns M-39 SB over M-10 Ramp C?

It is owned by the State Highway Agency.