US Bridges

Herman Dupuis Rd. over Coulee

GoodPosted for load

St. Martin Parish, Louisiana · 1.6 MI SW of LA 3177 · Structure no. 035030161914241

Built
1986
39 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete
Length
190 ft
10 main spans
Daily traffic
442
2020 count
Owner
County
County Highway Agency

About this bridge

Herman Dupuis Rd. over Coulee is a concrete slab carrying Herman Dupuis Rd. over Coulee in St. Martin Parish, Louisiana. It was built in 1986, so it is 39 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. Its operating status is: posted for load restriction.

It carries about 442 vehicles a day, projected to reach 486 by 2040. The structure is 190 ft (57.9 m) long and 31 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesHerman Dupuis Rd.
CrossesCoulee
Location1.6 MI SW of LA 3177
RouteCounty Highway 0
CountySt. Martin Parish
StateLouisiana
Coordinates30.26769, -91.70745
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating23.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans10
Design loadHS 20
Structure length190 ft (57.9 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic442 (2020)
Projected traffic486 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 Herman Dupuis Rd. over Coulee built?

It was built in 1986, making it 39 years old in 2025.

What condition is Herman Dupuis Rd. over Coulee 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 October 2024.

How much traffic does Herman Dupuis Rd. over Coulee carry?

About 442 vehicles per day (2020 count).

How long is Herman Dupuis Rd. over Coulee?

The structure is 190 ft (57.9 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns Herman Dupuis Rd. over Coulee?

It is owned by the County Highway Agency.