US Bridges

I-75 Ramp B over I-69

Fair

Genesee County, Michigan · NB I-75 Ramp to WB I-69 · Structure no. 000000000002541

Built
1969
56 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
339 ft
5 main spans
Daily traffic
3,060
1982 count
Owner
State
State Highway Agency

About this bridge

I-75 Ramp B over I-69 is a steel stringer/multi-beam or girder carrying I-75 Ramp B over I-69 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 3,060 vehicles a day, roughly 11% of them trucks, projected to reach 3,519 by 2002. The structure is 339 ft (103.3 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesI-75 Ramp B
CrossesI-69
LocationNB I-75 Ramp to WB I-69
RouteInterstate 75
CountyGenesee County
StateMichigan
Coordinates42.98374, -83.73623
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.
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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating47.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length339 ft (103.3 m)
Longest span83 ft (25.3 m)
Deck width35 ft (10.7 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,060 (1982)
Projected traffic3,519 by 2002
Trucks11%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 B over I-69 built?

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

What condition is I-75 Ramp B over I-69 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 B over I-69 carry?

About 3,060 vehicles per day (1982 count), of which roughly 11% are trucks.

How long is I-75 Ramp B over I-69?

The structure is 339 ft (103.3 m) long with a longest span of 83 ft (25.3 m) and a deck 35 ft wide.

Who owns I-75 Ramp B over I-69?

It is owned by the State Highway Agency.