US Bridges

M-39 SB over 9 Mile RD

Fair

Oakland County, Michigan · Southfield (top Level) · Structure no. 000000000007880

Built
1964
61 years old, rebuilt 1998
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
368 ft
3 main spans
Daily traffic
45,241
2007 count
Owner
State
State Highway Agency

About this bridge

M-39 SB over 9 Mile RD is a steel stringer/multi-beam or girder carrying M-39 SB over 9 Mile RD in Oakland 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 fair condition with a lowest component rating of 5 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 5% of them trucks, projected to reach 52,851 by 2018. The structure is 368 ft (112.3 m) long and 47 ft wide.

Location

Open in Google Maps
CarriesM-39 SB
Crosses9 Mile RD
LocationSouthfield (top Level)
RouteState Highway 39
CountyOakland County
StateMichigan
Coordinates42.45895, -83.2214
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating92.2 US tons
Inventory rating55 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length368 ft (112.3 m)
Longest span140 ft (42.7 m)
Deck width47 ft (14.3 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45,241 (2007)
Projected traffic52,851 by 2018
Trucks5%
Lanes on structure3
Traffic directionOne-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-39 SB over 9 Mile RD built?

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

What condition is M-39 SB over 9 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 October 2023.

How much traffic does M-39 SB over 9 Mile RD carry?

About 45,241 vehicles per day (2007 count), of which roughly 5% are trucks.

How long is M-39 SB over 9 Mile RD?

The structure is 368 ft (112.3 m) long with a longest span of 140 ft (42.7 m) and a deck 47 ft wide.

Who owns M-39 SB over 9 Mile RD?

It is owned by the State Highway Agency.