US Bridges

LA1045 over Natalbany River

Fair

St. Helena Parish, Louisiana · LA1045 · Structure no. 624608460504871

Built
1957
68 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete
Length
180 ft
9 main spans
Daily traffic
1,509
2021 count
Owner
State
State Highway Agency

About this bridge

LA1045 over Natalbany River is a concrete slab carrying LA1045 over Natalbany River in St. Helena Parish, Louisiana. It was built in 1957, so it is 68 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.

It carries about 1,509 vehicles a day, roughly 12% of them trucks, projected to reach 1,659 by 2041. The structure is 180 ft (54.9 m) long and 29 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesLA1045
CrossesNatalbany River
LocationLA1045
RouteState Highway 1045
CountySt. Helena Parish
StateLouisiana
Coordinates30.73233, -90.5815
Functional classRural Major Collector

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 protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43 US tons
Inventory rating26 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans9
Design loadH 15
Structure length180 ft (54.9 m)
Longest span20 ft (6.1 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,509 (2021)
Projected traffic1,659 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 LA1045 over Natalbany River built?

It was built in 1957, making it 68 years old in 2025.

What condition is LA1045 over Natalbany River 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 November 2024.

How much traffic does LA1045 over Natalbany River carry?

About 1,509 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is LA1045 over Natalbany River?

The structure is 180 ft (54.9 m) long with a longest span of 20 ft (6.1 m) and a deck 29 ft wide.

Who owns LA1045 over Natalbany River?

It is owned by the State Highway Agency.