US Bridges

I-75 Ramp C over I-75

Poor

Genesee County, Michigan · SB I-75 Ramp to EB I-69 · Structure no. 000000000002547

Built
1969
56 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
333 ft
6 main spans
Daily traffic
4,800
1988 count
Owner
State
State Highway Agency

About this bridge

I-75 Ramp C over I-75 is a steel stringer/multi-beam or girder carrying I-75 Ramp C over I-75 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 4,800 vehicles a day, roughly 12% of them trucks, projected to reach 5,520 by 2008. The structure is 333 ft (101.5 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-75 Ramp C
CrossesI-75
LocationSB I-75 Ramp to EB I-69
RouteInterstate 75
CountyGenesee County
StateMichigan
Coordinates42.98308, -83.73141
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.6 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length333 ft (101.5 m)
Longest span74 ft (22.5 m)
Deck width35 ft (10.7 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,800 (1988)
Projected traffic5,520 by 2008
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 C over I-75 built?

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

What condition is I-75 Ramp C over I-75 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does I-75 Ramp C over I-75 carry?

About 4,800 vehicles per day (1988 count), of which roughly 12% are trucks.

How long is I-75 Ramp C over I-75?

The structure is 333 ft (101.5 m) long with a longest span of 74 ft (22.5 m) and a deck 35 ft wide.

Who owns I-75 Ramp C over I-75?

It is owned by the State Highway Agency.