US Bridges

I-75 over Swartz Creek

Fair

Genesee County, Michigan · N of I-69 @ Interchg · Structure no. 000000000002471

Built
1954
71 years old, rebuilt 2010
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
66,912
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 over Swartz Creek is a steel stringer/multi-beam or girder carrying I-75 over Swartz Creek in Genesee County, Michigan. It was built in 1954 and reconstructed in 2010, so it is 71 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 66,912 vehicles a day, roughly 7% of them trucks, projected to reach 111,965 by 2018. The structure is 60 ft (18.3 m) long and 112 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-75
CrossesSwartz Creek
LocationN of I-69 @ Interchg
RouteInterstate 75
CountyGenesee County
StateMichigan
Coordinates42.98695, -83.73536
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.4 US tons
Inventory rating54.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span57 ft (17.5 m)
Deck width112 ft (34 m)
Roadway width105 ft (32 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic66,912 (2007)
Projected traffic111,965 by 2018
Trucks7%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-75 over Swartz Creek built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 2010.

What condition is I-75 over Swartz Creek 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 2024.

How much traffic does I-75 over Swartz Creek carry?

About 66,912 vehicles per day (2007 count), of which roughly 7% are trucks.

How long is I-75 over Swartz Creek?

The structure is 60 ft (18.3 m) long with a longest span of 57 ft (17.5 m) and a deck 112 ft wide.

Who owns I-75 over Swartz Creek?

It is owned by the State Highway Agency.