US Bridges

LA1181 over State Drainage Canal

Fair

Avoyelles Parish, Louisiana · 0.37 M. E of W. JCT LA 11 · Structure no. 080508052300371

Built
1987
38 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete
Length
39 ft
2 main spans
Daily traffic
1,716
2021 count
Owner
State
State Highway Agency

About this bridge

LA1181 over State Drainage Canal is a concrete slab carrying LA1181 over State Drainage Canal in Avoyelles Parish, Louisiana. It was built in 1987, so it is 38 years old, younger 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 1,716 vehicles a day, roughly 14% of them trucks, projected to reach 1,887 by 2041. The structure is 39 ft (11.9 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLA1181
CrossesState Drainage Canal
Location0.37 M. E of W. JCT LA 11
RouteState Highway 1181
CountyAvoyelles Parish
StateLouisiana
Coordinates30.9796, -91.9659
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating99 US tons
Inventory rating64 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,716 (2021)
Projected traffic1,887 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 LA1181 over State Drainage Canal built?

It was built in 1987, making it 38 years old in 2025.

What condition is LA1181 over State Drainage Canal 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 February 2024.

How much traffic does LA1181 over State Drainage Canal carry?

About 1,716 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA1181 over State Drainage Canal?

The structure is 39 ft (11.9 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns LA1181 over State Drainage Canal?

It is owned by the State Highway Agency.