US Bridges

I-75 SB over CSX RR

Fair

Saginaw County, Michigan · 0.3 MI S of M-46 · Structure no. 000000000014326

Built
2021
4 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
121 ft
1 main span
Daily traffic
32,900
2020 count
Owner
State
State Highway Agency

About this bridge

I-75 SB over CSX RR is a prestressed concrete stringer/multi-beam or girder carrying I-75 SB over CSX RR in Saginaw County, Michigan. It was built in 2021, so it is 4 years old, younger 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 32,900 vehicles a day, roughly 7% of them trucks, projected to reach 36,375 by 2040. The structure is 121 ft (36.9 m) long and 73 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesI-75 SB
CrossesCSX RR
Location0.3 MI S of M-46
RouteInterstate 75
CountySaginaw County
StateMichigan
Coordinates43.40945, -83.89114
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
Deck9 ExcellentNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure9 ExcellentNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.9 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length121 ft (36.9 m)
Longest span118 ft (36 m)
Deck width73 ft (22.3 m)
Roadway width70 ft (21.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,900 (2020)
Projected traffic36,375 by 2040
Trucks7%
Lanes on structure4
Traffic directionOne-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 SB over CSX RR built?

It was built in 2021, making it 4 years old in 2025.

What condition is I-75 SB over CSX 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 2023.

How much traffic does I-75 SB over CSX RR carry?

About 32,900 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is I-75 SB over CSX RR?

The structure is 121 ft (36.9 m) long with a longest span of 118 ft (36 m) and a deck 73 ft wide.

Who owns I-75 SB over CSX RR?

It is owned by the State Highway Agency.