US Bridges

LA0015 over Old River Low Sill C.S.

Fair

Concordia Parish, Louisiana · 75 MI NW of Baton Rouge · Structure no. 1770309321

Built
1959
66 years old, rebuilt 2019
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
977 ft
19 main spans
Daily traffic
807
2023 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

LA0015 over Old River Low Sill C.S. is a steel stringer/multi-beam or girder carrying LA0015 over Old River Low Sill C.S. in Concordia Parish, Louisiana. It was built in 1959 and reconstructed in 2019, so it is 66 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 5 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 807 vehicles a day, roughly 5% of them trucks, projected to reach 1,000 by 2043. The structure is 977 ft (297.7 m) long and 31 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

Open in Google Maps
CarriesLA0015
CrossesOld River Low Sill C.S.
Location75 MI NW of Baton Rouge
RouteState Highway 15
CountyConcordia Parish
StateLouisiana
Coordinates31.07657, -91.59765
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans19
Design loadHS 20
Structure length977 ft (297.7 m)
Longest span52 ft (16 m)
Deck width31 ft (9.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic807 (2023)
Projected traffic1,000 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed100 mi (161 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCorps of Engineers (Civil)
Maintained byCorps of Engineers (Civil)
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.1 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0015 over Old River Low Sill C.S. built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2019.

What condition is LA0015 over Old River Low Sill C.S. 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 August 2024.

How much traffic does LA0015 over Old River Low Sill C.S. carry?

About 807 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is LA0015 over Old River Low Sill C.S.?

The structure is 977 ft (297.7 m) long with a longest span of 52 ft (16 m) and a deck 31 ft wide.

Who owns LA0015 over Old River Low Sill C.S.?

It is owned by the Corps of Engineers (Civil).