US Bridges

I-75 Ramp D over Gtw RR

Fair

Genesee County, Michigan · NB I-75 Ramp to EB I-69 · Structure no. 000000000002530

Built
1969
56 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
266 ft
3 main spans
Daily traffic
32,800
1988 count
Owner
State
State Highway Agency

About this bridge

I-75 Ramp D over Gtw RR is a steel stringer/multi-beam or girder carrying I-75 Ramp D over Gtw RR 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 32,800 vehicles a day, roughly 12% of them trucks, projected to reach 37,720 by 2008. The structure is 266 ft (81.1 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesI-75 Ramp D
CrossesGtw RR
LocationNB I-75 Ramp to EB I-69
RouteInterstate 75
CountyGenesee County
StateMichigan
Coordinates42.983, -83.72939
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
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 geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length266 ft (81.1 m)
Longest span135 ft (41.1 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,800 (1988)
Projected traffic37,720 by 2008
Trucks12%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed3.1 mi (5 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 Ramp D over Gtw RR built?

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

What condition is I-75 Ramp D over Gtw 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 October 2024.

How much traffic does I-75 Ramp D over Gtw RR carry?

About 32,800 vehicles per day (1988 count), of which roughly 12% are trucks.

How long is I-75 Ramp D over Gtw RR?

The structure is 266 ft (81.1 m) long with a longest span of 135 ft (41.1 m) and a deck 27 ft wide.

Who owns I-75 Ramp D over Gtw RR?

It is owned by the State Highway Agency.