US Bridges

I-75 NB over D&m RR (abn)

Fair

Emmet County, Michigan · In Mackinaw City · Structure no. 000000000002452

Built
1957
68 years old, rebuilt 1975
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
255 ft
4 main spans
Daily traffic
10,100
2020 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over D&m RR (abn) is a steel stringer/multi-beam or girder carrying I-75 NB over D&m RR (abn) in Emmet County, Michigan. It was built in 1957 and reconstructed in 1975, so it is 68 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 6 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 10,100 vehicles a day, roughly 12% of them trucks, projected to reach 11,050 by 2042. The structure is 255 ft (77.7 m) long and 81 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-75 NB
CrossesD&m RR (abn)
LocationIn Mackinaw City
RouteInterstate 75
CountyEmmet County
StateMichigan
Coordinates45.78014, -84.73323
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating99.6 US tons
Inventory rating59.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length255 ft (77.7 m)
Longest span80 ft (24.3 m)
Deck width81 ft (24.8 m)
Roadway width73 ft (22.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,100 (2020)
Projected traffic11,050 by 2042
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 NB over D&m RR (abn) built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1975.

What condition is I-75 NB over D&m RR (abn) 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 August 2024.

How much traffic does I-75 NB over D&m RR (abn) carry?

About 10,100 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is I-75 NB over D&m RR (abn)?

The structure is 255 ft (77.7 m) long with a longest span of 80 ft (24.3 m) and a deck 81 ft wide.

Who owns I-75 NB over D&m RR (abn)?

It is owned by the State Highway Agency.