US Bridges

Grand Bois RD over Coulee

FairPosted for load

St. Martin Parish, Louisiana · 1.8 Mi. E. of LA 3039 · Structure no. 035030157914821

Built
1967
58 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
57 ft
3 main spans
Daily traffic
140
2020 count
Owner
County
County Highway Agency

About this bridge

Grand Bois RD over Coulee is a concrete slab carrying Grand Bois RD over Coulee in St. Martin Parish, Louisiana. It was built in 1967, so it is 58 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 140 vehicles a day, projected to reach 154 by 2040. The structure is 57 ft (17.4 m) long and 28 ft wide.

Location

Open in Google Maps
CarriesGrand Bois RD
CrossesCoulee
Location1.8 Mi. E. of LA 3039
RouteCounty Highway 0
CountySt. Martin Parish
StateLouisiana
Coordinates30.26192, -91.80316
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating23.6 US tons
Inventory rating18.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span19 ft (5.8 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (2020)
Projected traffic154 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Grand Bois RD over Coulee built?

It was built in 1967, making it 58 years old in 2025.

What condition is Grand Bois RD over Coulee 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 October 2024.

How much traffic does Grand Bois RD over Coulee carry?

About 140 vehicles per day (2020 count).

How long is Grand Bois RD over Coulee?

The structure is 57 ft (17.4 m) long with a longest span of 19 ft (5.8 m) and a deck 28 ft wide.

Who owns Grand Bois RD over Coulee?

It is owned by the County Highway Agency.