US Bridges

LA0117 over Relief Slough

Fair

Natchitoches Parish, Louisiana · .92 MI N of JCT LA 118 · Structure no. 083501140204611

Built
1955
70 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
120 ft
6 main spans
Daily traffic
1,513
2021 count
Owner
State
State Highway Agency

About this bridge

LA0117 over Relief Slough is a concrete slab carrying LA0117 over Relief Slough in Natchitoches Parish, Louisiana. It was built in 1955, so it is 70 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 1,513 vehicles a day, roughly 14% of them trucks, projected to reach 1,664 by 2041. The structure is 120 ft (36.6 m) long and 30 ft wide. If it were closed, the detour would be 28 mi (45 km).

Location

Open in Google Maps
CarriesLA0117
CrossesRelief Slough
Location.92 MI N of JCT LA 118
RouteState Highway 117
CountyNatchitoches Parish
StateLouisiana
Coordinates31.42676, -93.1716
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length120 ft (36.6 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,513 (2021)
Projected traffic1,664 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed28 mi (45 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$585,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0117 over Relief Slough built?

It was built in 1955, making it 70 years old in 2025.

What condition is LA0117 over Relief Slough 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 March 2024.

How much traffic does LA0117 over Relief Slough carry?

About 1,513 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA0117 over Relief Slough?

The structure is 120 ft (36.6 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns LA0117 over Relief Slough?

It is owned by the State Highway Agency.