US Bridges

I-75 to I-69 Rmp B over Gtw RR &I-75

Poor

Genesee County, Michigan · NB I-75 Rmp to WB I-69 · Structure no. 000000000002525

Built
1969
56 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
587 ft
8 main spans
Daily traffic
9,590
2019 count
Owner
State
State Highway Agency

About this bridge

I-75 to I-69 Rmp B over Gtw RR &I-75 is a steel stringer/multi-beam or girder carrying I-75 to I-69 Rmp B over Gtw RR &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 3 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 9,590 vehicles a day, roughly 8% of them trucks, projected to reach 10,595 by 2039. The structure is 587 ft (178.9 m) long and 35 ft wide.

Location

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CarriesI-75 to I-69 Rmp B
CrossesGtw RR &I-75
LocationNB I-75 Rmp to WB I-69
RouteInterstate 69
CountyGenesee County
StateMichigan
Coordinates42.98281, -83.731
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
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure4 PoorAdvanced section loss, deterioration, 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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating78.6 US tons
Inventory rating47.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length587 ft (178.9 m)
Longest span145 ft (44.2 m)
Deck width35 ft (10.7 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,590 (2019)
Projected traffic10,595 by 2039
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$246,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 to I-69 Rmp B over Gtw RR &I-75 built?

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

What condition is I-75 to I-69 Rmp B over Gtw RR &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 to I-69 Rmp B over Gtw RR &I-75 carry?

About 9,590 vehicles per day (2019 count), of which roughly 8% are trucks.

How long is I-75 to I-69 Rmp B over Gtw RR &I-75?

The structure is 587 ft (178.9 m) long with a longest span of 145 ft (44.2 m) and a deck 35 ft wide.

Who owns I-75 to I-69 Rmp B over Gtw RR &I-75?

It is owned by the State Highway Agency.