US Bridges

Smith Co. 503 over Thompson Branch

Good

Smith County, Mississippi · Sec 12 T 1N R 6E B · Structure no. SA6500000000003

Built
2006
19 years old
Condition
Good
inspected August 2024
Type
Culvert
Concrete
Length
20 ft
2 main spans
Daily traffic
400
2024 count
Owner
County
County Highway Agency

About this bridge

Smith Co. 503 over Thompson Branch is a concrete culvert carrying Smith Co. 503 over Thompson Branch in Smith County, Mississippi. It was built in 2006, so it is 19 years old, younger than the Mississippi average of 38.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 400 vehicles a day, roughly 8% of them trucks, projected to reach 600 by 2044. The structure is 20 ft (6.2 m) long. If it were closed, the detour would be 6.2 mi (10 km).

CarriesSmith Co. 503
CrossesThompson Branch
LocationSec 12 T 1N R 6E B
RouteCounty Highway 327
Coordinates31.93696, -89.641
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86 US tons
Inventory rating51.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length20 ft (6.2 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2024)
Projected traffic600 by 2044
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed6.2 mi (10 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$550,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Smith Co. 503 over Thompson Branch built?

It was built in 2006, making it 19 years old in 2025.

What condition is Smith Co. 503 over Thompson Branch in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does Smith Co. 503 over Thompson Branch carry?

About 400 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is Smith Co. 503 over Thompson Branch?

The structure is 20 ft (6.2 m) long with a longest span of 10 ft (3 m).

Who owns Smith Co. 503 over Thompson Branch?

It is owned by the County Highway Agency.