US Bridges

Durand Road over Porter Creek

FairPosted for load

Shiawassee County, Michigan · 1 Miles S.W. of New Lothr · Structure no. 000000000009822

Built
1956
69 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete
Length
45 ft
1 main span
Daily traffic
1,789
2019 count
Owner
County
County Highway Agency

About this bridge

Durand Road over Porter Creek is a concrete tee beam carrying Durand Road over Porter Creek in Shiawassee County, Michigan. It was built in 1956, so it is 69 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 1,789 vehicles a day, roughly 5% of them trucks, projected to reach 2,183 by 2039. The structure is 45 ft (13.7 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesDurand Road
CrossesPorter Creek
Location1 Miles S.W. of New Lothr
RouteCounty Highway 7687
CountyShiawassee County
StateMichigan
Coordinates43.10366, -83.98766
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.1 US tons
Inventory rating20.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span40 ft (12.2 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,789 (2019)
Projected traffic2,183 by 2039
Trucks5%
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 Durand Road over Porter Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is Durand Road over Porter Creek 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 May 2024.

How much traffic does Durand Road over Porter Creek carry?

About 1,789 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is Durand Road over Porter Creek?

The structure is 45 ft (13.7 m) long with a longest span of 40 ft (12.2 m) and a deck 30 ft wide.

Who owns Durand Road over Porter Creek?

It is owned by the County Highway Agency.