US Bridges

HWY 645 Local over Bayou Boudreaux

Good

Lafourche Parish, Louisiana · 2.3M NW of LA 1 · Structure no. 022929480905611

Built
1993
32 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete
Length
57 ft
3 main spans
Daily traffic
198
2006 count
Owner
County
County Highway Agency

About this bridge

HWY 645 Local over Bayou Boudreaux is a concrete slab carrying HWY 645 Local over Bayou Boudreaux in Lafourche Parish, Louisiana. It was built in 1993, so it is 32 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 198 vehicles a day, projected to reach 217 by 2026. The structure is 57 ft (17.4 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesHWY 645 Local
CrossesBayou Boudreaux
Location2.3M NW of LA 1
RouteCounty Highway 0
CountyLafourche Parish
StateLouisiana
Coordinates29.80069, -90.93533
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.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span19 ft (5.8 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic198 (2006)
Projected traffic217 by 2026
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 645 Local over Bayou Boudreaux built?

It was built in 1993, making it 32 years old in 2025.

What condition is HWY 645 Local over Bayou Boudreaux 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 June 2023.

How much traffic does HWY 645 Local over Bayou Boudreaux carry?

About 198 vehicles per day (2006 count).

How long is HWY 645 Local over Bayou Boudreaux?

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 HWY 645 Local over Bayou Boudreaux?

It is owned by the County Highway Agency.