US Bridges

Duffield Road over Shiawassee River

Good

Genesee County, Michigan · North of Silver Lake RD · Structure no. 000000000002734

Built
1924
101 years old, rebuilt 2010
Condition
Good
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
1,618
2018 count
Owner
County
County Highway Agency

About this bridge

Duffield Road over Shiawassee River is a prestressed concrete box beam or girders - multiple carrying Duffield Road over Shiawassee River in Genesee County, Michigan. It was built in 1924 and reconstructed in 2010, so it is 101 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,618 vehicles a day, roughly 5% of them trucks, projected to reach 2,922 by 2038. The structure is 45 ft (13.6 m) long and 39 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

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CarriesDuffield Road
CrossesShiawassee River
LocationNorth of Silver Lake RD
RouteCounty Highway 2505
CountyGenesee County
StateMichigan
Coordinates42.81679, -83.8953
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.3 US tons
Inventory rating46.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length45 ft (13.6 m)
Longest span41 ft (12.5 m)
Deck width39 ft (11.9 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,618 (2018)
Projected traffic2,922 by 2038
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 Duffield Road over Shiawassee River built?

It was built in 1924, making it 101 years old in 2025. It was reconstructed in 2010.

What condition is Duffield Road over Shiawassee River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.

How much traffic does Duffield Road over Shiawassee River carry?

About 1,618 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Duffield Road over Shiawassee River?

The structure is 45 ft (13.6 m) long with a longest span of 41 ft (12.5 m) and a deck 39 ft wide.

Who owns Duffield Road over Shiawassee River?

It is owned by the County Highway Agency.