US Bridges

I-75 NB over M-27|S Straits HWY

Fair

Cheboygan County, Michigan · @ M-27 · Structure no. 000000000001511

Built
1962
63 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
230 ft
3 main spans
Daily traffic
7,777
2018 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over M-27|S Straits HWY is a steel stringer/multi-beam or girder carrying I-75 NB over M-27|S Straits HWY in Cheboygan County, Michigan. It was built in 1962, so it is 63 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 7,777 vehicles a day, roughly 6% of them trucks, projected to reach 8,944 by 2038. The structure is 230 ft (70.2 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 NB
CrossesM-27|S Straits HWY
Location@ M-27
RouteInterstate 75
CountyCheboygan County
StateMichigan
Coordinates45.45054, -84.61054
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating89.3 US tons
Inventory rating53.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length230 ft (70.2 m)
Longest span93 ft (28.4 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,777 (2018)
Projected traffic8,944 by 2038
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 M-27|S Straits HWY built?

It was built in 1962, making it 63 years old in 2025.

What condition is I-75 NB over M-27|S Straits HWY 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 April 2023.

How much traffic does I-75 NB over M-27|S Straits HWY carry?

About 7,777 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is I-75 NB over M-27|S Straits HWY?

The structure is 230 ft (70.2 m) long with a longest span of 93 ft (28.4 m) and a deck 35 ft wide.

Who owns I-75 NB over M-27|S Straits HWY?

It is owned by the State Highway Agency.