US Bridges

Atherton Road over Thread River

Fair

Genesee County, Michigan · 0.25 Mile W of Center RD · Structure no. 000000000002718

Built
1928
97 years old, rebuilt 2012
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
10,339
2008 count
Owner
City
City or Municipal Highway Agency

About this bridge

Atherton Road over Thread River is a prestressed concrete box beam or girders - single or spread carrying Atherton Road over Thread River in Genesee County, Michigan. It was built in 1928 and reconstructed in 2012, so it is 97 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 10,339 vehicles a day, roughly 5% of them trucks, projected to reach 15,983 by 2030. The structure is 45 ft (13.7 m) long and 64 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesAtherton Road
CrossesThread River
Location0.25 Mile W of Center RD
RouteCity Street 2002
CountyGenesee County
StateMichigan
Coordinates42.98946, -83.63812
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
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
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.7 US tons
Inventory rating65.4 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length45 ft (13.7 m)
Longest span42 ft (12.9 m)
Deck width64 ft (19.5 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,339 (2008)
Projected traffic15,983 by 2030
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Atherton Road over Thread River built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 2012.

What condition is Atherton Road over Thread 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 Atherton Road over Thread River carry?

About 10,339 vehicles per day (2008 count), of which roughly 5% are trucks.

How long is Atherton Road over Thread River?

The structure is 45 ft (13.7 m) long with a longest span of 42 ft (12.9 m) and a deck 64 ft wide.

Who owns Atherton Road over Thread River?

It is owned by the City or Municipal Highway Agency.