US Bridges

I-75 over Norfolk Southern RR

Fair

Monroe County, Michigan · 0.9 MI N of M-50 · Structure no. 000000000007196

Built
1955
70 years old, rebuilt 2016
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
206 ft
3 main spans
Daily traffic
65,200
2013 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 and reconstructed in 2016, 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 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 65,200 vehicles a day, roughly 21% of them trucks, projected to reach 71,200 by 2035. The structure is 206 ft (62.7 m) long and 126 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesI-75
CrossesNorfolk Southern RR
Location0.9 MI N of M-50
RouteInterstate 75
CountyMonroe County
StateMichigan
Coordinates41.94006, -83.36126
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56.4 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length206 ft (62.7 m)
Longest span74 ft (22.7 m)
Deck width126 ft (38.3 m)
Roadway width119 ft (36.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65,200 (2013)
Projected traffic71,200 by 2035
Trucks21%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed5 mi (8 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$6,000
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. It was reconstructed in 2016.

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 September 2024.

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

About 65,200 vehicles per day (2013 count), of which roughly 21% are trucks.

How long is I-75 over Norfolk Southern RR?

The structure is 206 ft (62.7 m) long with a longest span of 74 ft (22.7 m) and a deck 126 ft wide.

Who owns I-75 over Norfolk Southern RR?

It is owned by the State Highway Agency.