US Bridges

Rea RD over Au Sable River

Fair

Iosco County, Michigan · 6 MI W of Oscoda (1/4 MI · Structure no. 000000000004140

Built
1957
68 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete
Length
239 ft
7 main spans
Daily traffic
1,200
2019 count
Owner
County
County Highway Agency

About this bridge

Rea RD over Au Sable River is a concrete tee beam carrying Rea RD over Au Sable River in Iosco County, Michigan. It was built in 1957, 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 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 1,200 vehicles a day, roughly 10% of them trucks, projected to reach 2,160 by 2039. The structure is 239 ft (72.7 m) long and 27 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesRea RD
CrossesAu Sable River
Location6 MI W of Oscoda (1/4 MI
RouteCounty Highway 3575
CountyIosco County
StateMichigan
Coordinates44.43615, -83.43407
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating36.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadH 15
Structure length239 ft (72.7 m)
Longest span34 ft (10.3 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2019)
Projected traffic2,160 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 Rea RD over Au Sable River built?

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

What condition is Rea RD over Au Sable 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 June 2023.

How much traffic does Rea RD over Au Sable River carry?

About 1,200 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is Rea RD over Au Sable River?

The structure is 239 ft (72.7 m) long with a longest span of 34 ft (10.3 m) and a deck 27 ft wide.

Who owns Rea RD over Au Sable River?

It is owned by the County Highway Agency.