US Bridges

Longlois Hill RD over Bayou Grande

Good

Natchitoches Parish, Louisiana · 1.1 Miles North of LA 120 · Structure no. 083531374930441

Built
2003
22 years old
Condition
Good
inspected February 2023
Type
Slab
Concrete
Length
114 ft
6 main spans
Daily traffic
52
2022 count
Owner
County
County Highway Agency

About this bridge

Longlois Hill RD over Bayou Grande is a concrete slab carrying Longlois Hill RD over Bayou Grande in Natchitoches Parish, Louisiana. It was built in 2003, so it is 22 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 52 vehicles a day, projected to reach 57 by 2042. The structure is 114 ft (34.7 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesLonglois Hill RD
CrossesBayou Grande
Location1.1 Miles North of LA 120
RouteCounty Highway 0
CountyNatchitoches Parish
StateLouisiana
Coordinates31.62519, -93.0736
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 alignment7: Better than present minimum criteria
Operating rating55 US tons
Inventory rating42.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans6
Design loadHS 20
Structure length114 ft (34.7 m)
Longest span19 ft (5.8 m)
Deck width27 ft (8.2 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52 (2022)
Projected traffic57 by 2042
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Longlois Hill RD over Bayou Grande built?

It was built in 2003, making it 22 years old in 2025.

What condition is Longlois Hill RD over Bayou Grande 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 February 2023.

How much traffic does Longlois Hill RD over Bayou Grande carry?

About 52 vehicles per day (2022 count).

How long is Longlois Hill RD over Bayou Grande?

The structure is 114 ft (34.7 m) long with a longest span of 19 ft (5.8 m) and a deck 27 ft wide.

Who owns Longlois Hill RD over Bayou Grande?

It is owned by the County Highway Agency.