US Bridges

Thornton Street over Horseshoe Bayou

Fair

Washington County, Mississippi · Sec 11 T18N R 8W · Structure no. SA7600000000251

Built
1974
51 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
78 ft
1 main span
Daily traffic
270
2023 count
Owner
County
County Highway Agency

About this bridge

Thornton Street over Horseshoe Bayou is a prestressed concrete stringer/multi-beam or girder carrying Thornton Street over Horseshoe Bayou in Washington County, Mississippi. It was built in 1974, so it is 51 years old, older than the Mississippi average of 38.9 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 270 vehicles a day, roughly 8% of them trucks, projected to reach 378 by 2043. The structure is 78 ft (23.8 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesThornton Street
CrossesHorseshoe Bayou
LocationSec 11 T18N R 8W
RouteCity Street 9667
Coordinates33.42911, -91.02638
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.7 US tons
Inventory rating37.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1 (+2 approach)
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span40 ft (12.2 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic270 (2023)
Projected traffic378 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$926,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Thornton Street over Horseshoe Bayou built?

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

What condition is Thornton Street over Horseshoe Bayou 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 October 2024.

How much traffic does Thornton Street over Horseshoe Bayou carry?

About 270 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Thornton Street over Horseshoe Bayou?

The structure is 78 ft (23.8 m) long with a longest span of 40 ft (12.2 m) and a deck 30 ft wide.

Who owns Thornton Street over Horseshoe Bayou?

It is owned by the County Highway Agency.