US Bridges

Herman Dupuis RD over Bayou LA Rose

Good

St. Martin Parish, Louisiana · 0.5 MI E of LA 352 · Structure no. 035000000035007

Built
2023
2 years old
Condition
Good
inspected October 2024
Type
Movable - Swing
Steel
Length
270 ft
2 main spans
Daily traffic
1,232
2020 count
Owner
County
County Highway Agency

About this bridge

Herman Dupuis RD over Bayou LA Rose is a steel movable - swing carrying Herman Dupuis RD over Bayou LA Rose in St. Martin Parish, Louisiana. It was built in 2023, so it is 2 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,232 vehicles a day, projected to reach 1,355 by 2040. The structure is 270 ft (82.3 m) long and 25 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesHerman Dupuis RD
CrossesBayou LA Rose
Location0.5 MI E of LA 352
RouteCounty Highway 0
CountySt. Martin Parish
StateLouisiana
Coordinates30.28169, -91.73599
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating48.2 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+6 approach)
Design loadHL 93
Structure length270 ft (82.3 m)
Longest span62 ft (19 m)
Deck width25 ft (7.6 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,232 (2020)
Projected traffic1,355 by 2040
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 Bayou LA Rose built?

It was built in 2023, making it 2 years old in 2025.

What condition is Herman Dupuis RD over Bayou LA Rose 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 Bayou LA Rose carry?

About 1,232 vehicles per day (2020 count).

How long is Herman Dupuis RD over Bayou LA Rose?

The structure is 270 ft (82.3 m) long with a longest span of 62 ft (19 m) and a deck 25 ft wide.

Who owns Herman Dupuis RD over Bayou LA Rose?

It is owned by the County Highway Agency.