US Bridges

Mackinaw Road over Augres River

Fair

Arenac County, Michigan · 0.3 MI S of Bessinger RD · Structure no. 000000000000468

Built
1988
37 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
117 ft
3 main spans
Daily traffic
155
2018 count
Owner
County
County Highway Agency

About this bridge

Mackinaw Road over Augres River is a prestressed concrete tee beam carrying Mackinaw Road over Augres River in Arenac County, Michigan. It was built in 1988, so it is 37 years old, younger 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 155 vehicles a day, roughly 8% of them trucks, projected to reach 170 by 2038. The structure is 117 ft (35.6 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMackinaw Road
CrossesAugres River
Location0.3 MI S of Bessinger RD
RouteCounty Highway 0
CountyArenac County
StateMichigan
Coordinates44.08014, -83.68588
Functional classRural Minor Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating34.3 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length117 ft (35.6 m)
Longest span38 ft (11.5 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic155 (2018)
Projected traffic170 by 2038
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Mackinaw Road over Augres River built?

It was built in 1988, making it 37 years old in 2025.

What condition is Mackinaw Road over Augres 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 2024.

How much traffic does Mackinaw Road over Augres River carry?

About 155 vehicles per day (2018 count), of which roughly 8% are trucks.

How long is Mackinaw Road over Augres River?

The structure is 117 ft (35.6 m) long with a longest span of 38 ft (11.5 m) and a deck 32 ft wide.

Who owns Mackinaw Road over Augres River?

It is owned by the County Highway Agency.