US Bridges

I-75 Ramp L over Swartz Creek

Fair

Genesee County, Michigan · NB I-75 Rmp to Miller RD · Structure no. 000000000002521

Built
1969
56 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
57 ft
1 main span
Daily traffic
4,200
1988 count
Owner
State
State Highway Agency

About this bridge

I-75 Ramp L over Swartz Creek is a steel stringer/multi-beam or girder carrying I-75 Ramp L over Swartz Creek in Genesee County, Michigan. It was built in 1969, so it is 56 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 4,200 vehicles a day, roughly 12% of them trucks, projected to reach 4,830 by 2008. The structure is 57 ft (17.3 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI-75 Ramp L
CrossesSwartz Creek
LocationNB I-75 Rmp to Miller RD
RouteInterstate 75
CountyGenesee County
StateMichigan
Coordinates42.98721, -83.73467
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69.3 US tons
Inventory rating41.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length57 ft (17.3 m)
Longest span57 ft (17.3 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,200 (1988)
Projected traffic4,830 by 2008
Trucks12%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-75 Ramp L over Swartz Creek built?

It was built in 1969, making it 56 years old in 2025.

What condition is I-75 Ramp L 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 Ramp L over Swartz Creek carry?

About 4,200 vehicles per day (1988 count), of which roughly 12% are trucks.

How long is I-75 Ramp L over Swartz Creek?

The structure is 57 ft (17.3 m) long with a longest span of 57 ft (17.3 m) and a deck 27 ft wide.

Who owns I-75 Ramp L over Swartz Creek?

It is owned by the State Highway Agency.