US Bridges

Lyons Rd. over Thornwell Drainage Canal

Poor

Jefferson Davis Parish, Louisiana · 0.6 MI S of LA 380 · Structure no. 072730052924351

Built
1974
51 years old
Condition
Poor
inspected September 2024
Type
Slab
Concrete
Length
45 ft
3 main spans
Daily traffic
75
2019 count
Owner
County
County Highway Agency

About this bridge

Lyons Rd. over Thornwell Drainage Canal is a concrete slab carrying Lyons Rd. over Thornwell Drainage Canal in Jefferson Davis Parish, Louisiana. It was built in 1974, so it is 51 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 75 vehicles a day, projected to reach 82 by 2039. The structure is 45 ft (13.7 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesLyons Rd.
CrossesThornwell Drainage Canal
Location0.6 MI S of LA 380
RouteCounty Highway 0
CountyJefferson Davis Parish
StateLouisiana
Coordinates30.08646, -92.72415
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be 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 rating27.9 US tons
Inventory rating21.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span15 ft (4.6 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2019)
Projected traffic82 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Lyons Rd. over Thornwell Drainage Canal built?

It was built in 1974, making it 51 years old in 2025.

What condition is Lyons Rd. over Thornwell Drainage Canal in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does Lyons Rd. over Thornwell Drainage Canal carry?

About 75 vehicles per day (2019 count).

How long is Lyons Rd. over Thornwell Drainage Canal?

The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 22 ft wide.

Who owns Lyons Rd. over Thornwell Drainage Canal?

It is owned by the County Highway Agency.