US Bridges

Smith Co. 504 over Leaf River

Good

Smith County, Mississippi · Sec 36 T 4N R 8E B · Structure no. SA6500000000111

Built
2000
25 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
660 ft
16 main spans
Daily traffic
330
2021 count
Owner
County
County Highway Agency

About this bridge

Smith Co. 504 over Leaf River is a prestressed concrete stringer/multi-beam or girder carrying Smith Co. 504 over Leaf River in Smith County, Mississippi. It was built in 2000, so it is 25 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 330 vehicles a day, roughly 10% of them trucks, projected to reach 445 by 2043. The structure is 660 ft (201.2 m) long and 31 ft wide. If it were closed, the detour would be 13 mi (21 km).

CarriesSmith Co. 504
CrossesLeaf River
LocationSec 36 T 4N R 8E B
RouteCounty Highway 330
Coordinates32.14817, -89.42566
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.7 US tons
Inventory rating39.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans16
Design loadHS 20
Structure length660 ft (201.2 m)
Longest span60 ft (18.2 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic330 (2021)
Projected traffic445 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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$4.4 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Smith Co. 504 over Leaf River built?

It was built in 2000, making it 25 years old in 2025.

What condition is Smith Co. 504 over Leaf River 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 October 2023.

How much traffic does Smith Co. 504 over Leaf River carry?

About 330 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Smith Co. 504 over Leaf River?

The structure is 660 ft (201.2 m) long with a longest span of 60 ft (18.2 m) and a deck 31 ft wide.

Who owns Smith Co. 504 over Leaf River?

It is owned by the County Highway Agency.