US Bridges

M-75|S East ST over Boyne River

Fair

Charlevoix County, Michigan · In Boyne City · Structure no. 000000000001475

Built
1974
51 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
57 ft
1 main span
Daily traffic
6,546
2007 count
Owner
State
State Highway Agency

About this bridge

M-75|S East ST over Boyne River is a prestressed concrete stringer/multi-beam or girder carrying M-75|S East ST over Boyne River in Charlevoix 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 6,546 vehicles a day, roughly 3% of them trucks, projected to reach 9,561 by 2018. The structure is 57 ft (17.3 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesM-75|S East ST
CrossesBoyne River
LocationIn Boyne City
RouteState Highway 75
CountyCharlevoix County
StateMichigan
Coordinates45.21461, -85.01155
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating73.2 US tons
Inventory rating34.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length57 ft (17.3 m)
Longest span53 ft (16.2 m)
Deck width36 ft (10.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,546 (2007)
Projected traffic9,561 by 2018
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-75|S East ST over Boyne River built?

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

What condition is M-75|S East ST over Boyne River 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 2023.

How much traffic does M-75|S East ST over Boyne River carry?

About 6,546 vehicles per day (2007 count), of which roughly 3% are trucks.

How long is M-75|S East ST over Boyne River?

The structure is 57 ft (17.3 m) long with a longest span of 53 ft (16.2 m) and a deck 36 ft wide.

Who owns M-75|S East ST over Boyne River?

It is owned by the State Highway Agency.