US Bridges

I-475 Ramp B over I-75

Poor

Genesee County, Michigan · N JCT I-75 · Structure no. 000000000002692

Built
1971
54 years old, rebuilt 1999
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
402 ft
4 main spans
Daily traffic
11,989
2007 count
Owner
State
State Highway Agency

About this bridge

I-475 Ramp B over I-75 is a steel stringer/multi-beam or girder carrying I-475 Ramp B over I-75 in Genesee County, Michigan. It was built in 1971 and reconstructed in 1999, so it is 54 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 11,989 vehicles a day, roughly 9% of them trucks, projected to reach 12,845 by 2018. The structure is 402 ft (122.5 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI-475 Ramp B
CrossesI-75
LocationN JCT I-75
RouteInterstate 475
CountyGenesee County
StateMichigan
Coordinates43.09739, -83.76299
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 14 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 geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.1 US tons
Inventory rating51.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length402 ft (122.5 m)
Longest span149 ft (45.4 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deck15 ft (4.4 m)

Traffic and service

Average daily traffic11,989 (2007)
Projected traffic12,845 by 2018
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
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-475 Ramp B over I-75 built?

It was built in 1971, making it 54 years old in 2025. It was reconstructed in 1999.

What condition is I-475 Ramp B 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 July 2024.

How much traffic does I-475 Ramp B over I-75 carry?

About 11,989 vehicles per day (2007 count), of which roughly 9% are trucks.

How long is I-475 Ramp B over I-75?

The structure is 402 ft (122.5 m) long with a longest span of 149 ft (45.4 m) and a deck 44 ft wide.

Who owns I-475 Ramp B over I-75?

It is owned by the State Highway Agency.