US Bridges

Parish RD 685 over Bayou Tigre

Fair

Vermilion Parish, Louisiana · 0.78 MI S. of LA 14 · Structure no. 035708573300781

Built
1961
64 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
100 ft
5 main spans
Daily traffic
1,298
2020 count
Owner
County
County Highway Agency

About this bridge

Parish RD 685 over Bayou Tigre is a concrete slab carrying Parish RD 685 over Bayou Tigre in Vermilion Parish, Louisiana. It was built in 1961, so it is 64 years old, older than the Louisiana average of 43 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.

It carries about 1,298 vehicles a day, roughly 12% of them trucks, projected to reach 1,427 by 2040. The structure is 100 ft (30.5 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesParish RD 685
CrossesBayou Tigre
Location0.78 MI S. of LA 14
RouteCounty Highway 0
CountyVermilion Parish
StateLouisiana
Coordinates29.94741, -92.03728
Functional classRural Minor 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 protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating24 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,298 (2020)
Projected traffic1,427 by 2040
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Parish RD 685 over Bayou Tigre built?

It was built in 1961, making it 64 years old in 2025.

What condition is Parish RD 685 over Bayou Tigre 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 September 2023.

How much traffic does Parish RD 685 over Bayou Tigre carry?

About 1,298 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is Parish RD 685 over Bayou Tigre?

The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns Parish RD 685 over Bayou Tigre?

It is owned by the County Highway Agency.