US Bridges

Coons RD over Big Four Ditch

FairPosted for load

Vermilion Parish, Louisiana · .7 MI E of Ellis Bridge R · Structure no. 035729578923611

Built
1978
47 years old, rebuilt 2020
Condition
Fair
inspected July 2023
Type
Channel Beam
Prestressed Concrete
Length
48 ft
2 main spans
Daily traffic
30
2022 count
Owner
County
County Highway Agency

About this bridge

Coons RD over Big Four Ditch is a prestressed concrete channel beam carrying Coons RD over Big Four Ditch in Vermilion Parish, Louisiana. It was built in 1978 and reconstructed in 2020, so it is 47 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. Its operating status is: posted for load restriction.

It carries about 30 vehicles a day, projected to reach 33 by 2042. The structure is 48 ft (14.6 m) long and 22 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCoons RD
CrossesBig Four Ditch
Location.7 MI E of Ellis Bridge R
RouteCounty Highway 0
CountyVermilion Parish
StateLouisiana
Coordinates29.96275, -92.6011
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating15.8 US tons
Inventory rating11.5 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length48 ft (14.6 m)
Longest span24 ft (7.3 m)
Deck width22 ft (6.7 m)
Roadway width21 ft (6.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2022)
Projected traffic33 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$190,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Coons RD over Big Four Ditch built?

It was built in 1978, making it 47 years old in 2025. It was reconstructed in 2020.

What condition is Coons RD over Big Four Ditch 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 July 2023.

How much traffic does Coons RD over Big Four Ditch carry?

About 30 vehicles per day (2022 count).

How long is Coons RD over Big Four Ditch?

The structure is 48 ft (14.6 m) long with a longest span of 24 ft (7.3 m) and a deck 22 ft wide.

Who owns Coons RD over Big Four Ditch?

It is owned by the County Highway Agency.