Indigo Rd. over Bayou Plaquemine

Good

Acadia Parish, Louisiana · 1.83 Mi. E. of LA 13 · Structure no. 030100000030388

Built: 2005; 20 years old
Condition: Good; inspected July 2024
Type: Slab; Prestressed Concrete
Length: 200 ft; 10 main spans
Daily traffic: 10; 2021 count
Owner: County; County Highway Agency

About this bridge

Indigo Rd. over Bayou Plaquemine is a prestressed concrete slab carrying Indigo Rd. over Bayou Plaquemine in Acadia Parish, Louisiana. It was built in 2005, so it is 20 years old, younger than the Louisiana average of 43 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 10 vehicles a day, projected to reach 11 by 2041. The structure is 200 ft (61 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesIndigo Rd.

CrossesBayou Plaquemine

Location1.83 Mi. E. of LA 13

RouteCounty Highway 0

CountyAcadia Parish

StateLouisiana

Coordinates30.2689, -92.3709

Functional classRural Local

Condition and inspection

Good

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

Component	Rating	Meaning
Deck	7 Good	Some minor problems.
Superstructure	7 Good	Some minor problems.
Substructure	8 Very Good	No problems noted.
Channel and channel protection	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.

Last inspectionJuly 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation7: Better than present minimum criteria

Deck geometry6: Equal to present minimum criteria

Waterway adequacy6: Equal to present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating50 US tons

Inventory rating38.6 US tons

Structure

Structure typeSlab

MaterialPrestressed Concrete

DeckConcrete, precast panels

Main spans10

Design loadHS 20

Structure length200 ft (61 m)

Longest span20 ft (6.1 m)

Deck width27 ft (8.2 m)

Roadway width24 ft (7.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2021)

Projected traffic11 by 2041

Trucks—

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed5 mi (8 km)

TollOn a free road

National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency

Maintained byCounty Highway Agency

Historic statusHistorical significance not determinable at this time

Work proposedNone recorded

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was Indigo Rd. over Bayou Plaquemine built?

It was built in 2005, making it 20 years old in 2025.

What condition is Indigo Rd. over Bayou Plaquemine 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 July 2024.

How much traffic does Indigo Rd. over Bayou Plaquemine carry?

About 10 vehicles per day (2021 count).

How long is Indigo Rd. over Bayou Plaquemine?

The structure is 200 ft (61 m) long with a longest span of 20 ft (6.1 m) and a deck 27 ft wide.

Who owns Indigo Rd. over Bayou Plaquemine?

It is owned by the County Highway Agency.