US Bridges

I-75 over Norfolk Southern RR

Fair

Monroe County, Michigan · In Monroe · Structure no. 000000000007174

Built
1955
70 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
196 ft
3 main spans
Daily traffic
63,962
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 over Norfolk Southern RR is a steel stringer/multi-beam or girder carrying I-75 over Norfolk Southern RR in Monroe County, Michigan. It was built in 1955, so it is 70 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 63,962 vehicles a day, roughly 22% of them trucks, projected to reach 74,644 by 2018. The structure is 196 ft (59.6 m) long and 117 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesI-75
CrossesNorfolk Southern RR
LocationIn Monroe
RouteInterstate 75
CountyMonroe County
StateMichigan
Coordinates41.90578, -83.3689
Functional classUrban Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 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 rating93.3 US tons
Inventory rating55.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length196 ft (59.6 m)
Longest span73 ft (22.1 m)
Deck width117 ft (35.7 m)
Roadway width111 ft (33.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic63,962 (2007)
Projected traffic74,644 by 2018
Trucks22%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-75 over Norfolk Southern RR built?

It was built in 1955, making it 70 years old in 2025.

What condition is I-75 over Norfolk Southern RR 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 June 2023.

How much traffic does I-75 over Norfolk Southern RR carry?

About 63,962 vehicles per day (2007 count), of which roughly 22% are trucks.

How long is I-75 over Norfolk Southern RR?

The structure is 196 ft (59.6 m) long with a longest span of 73 ft (22.1 m) and a deck 117 ft wide.

Who owns I-75 over Norfolk Southern RR?

It is owned by the State Highway Agency.