US Bridges

Gaynier RD over I-75

Fair

Monroe County, Michigan · 5.7 MI SW of Monroe · Structure no. 000000000007180

Built
1974
51 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
246 ft
2 main spans
Daily traffic
240
2022 count
Owner
State
State Highway Agency

About this bridge

Gaynier RD over I-75 is a steel stringer/multi-beam or girder carrying Gaynier RD over I-75 in Monroe County, Michigan. It was built in 1974, so it is 51 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 240 vehicles a day, projected to reach 276 by 2042. The structure is 246 ft (75 m) long and 39 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesGaynier RD
CrossesI-75
Location5.7 MI SW of Monroe
RouteCounty Highway 0
CountyMonroe County
StateMichigan
Coordinates41.82357, -83.43561
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionSeptember 2023
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 alignment6: Equal to present minimum criteria
Operating rating89 US tons
Inventory rating53.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length246 ft (75 m)
Longest span132 ft (40.2 m)
Deck width39 ft (12 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic240 (2022)
Projected traffic276 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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 Gaynier RD over I-75 built?

It was built in 1974, making it 51 years old in 2025.

What condition is Gaynier RD over I-75 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 September 2023.

How much traffic does Gaynier RD over I-75 carry?

About 240 vehicles per day (2022 count).

How long is Gaynier RD over I-75?

The structure is 246 ft (75 m) long with a longest span of 132 ft (40.2 m) and a deck 39 ft wide.

Who owns Gaynier RD over I-75?

It is owned by the State Highway Agency.