US Bridges

Mackinaw Road over Augres River

PoorPosted for load

Arenac County, Michigan · 0.8 MI N of Bessinger RD · Structure no. 000000000000476

Built
1985
40 years old
Condition
Poor
inspected August 2024
Type
Slab
Wood or Timber
Length
96 ft
3 main spans
Daily traffic
200
2017 count
Owner
County
County Highway Agency

About this bridge

Mackinaw Road over Augres River is a wood or timber slab carrying Mackinaw Road over Augres River in Arenac County, Michigan. It was built in 1985, so it is 40 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 200 vehicles a day, roughly 10% of them trucks, projected to reach 220 by 2037. The structure is 96 ft (29.2 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesMackinaw Road
CrossesAugres River
Location0.8 MI N of Bessinger RD
RouteCounty Highway 0
CountyArenac County
StateMichigan
Coordinates44.09698, -83.68582
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.1 US tons
Inventory rating27.4 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 20 + Mod
Structure length96 ft (29.2 m)
Longest span32 ft (9.7 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2017)
Projected traffic220 by 2037
Trucks10%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.7 million (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mackinaw Road over Augres River built?

It was built in 1985, making it 40 years old in 2025.

What condition is Mackinaw Road over Augres River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does Mackinaw Road over Augres River carry?

About 200 vehicles per day (2017 count), of which roughly 10% are trucks.

How long is Mackinaw Road over Augres River?

The structure is 96 ft (29.2 m) long with a longest span of 32 ft (9.7 m) and a deck 25 ft wide.

Who owns Mackinaw Road over Augres River?

It is owned by the County Highway Agency.